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Puzzles
Classic Puzzle - Hard
To start
The Labyrinth
XP
+250 XP
Completed by 8,085 CodinGamers
0
done
Death First Search - Episode 2
Death First Search - Episode 2
XP
+250 XP
Completed by 6,884 CodinGamers
0
done
The Bridge
XP
+375 XP
Completed by 3,593 CodinGamers
0
done
Winamax Sponsored Contest
XP
+250 XP
Completed by 2,036 CodinGamers
0
done
Don't Panic - Episode 2
XP
+250 XP
Completed by 1,545 CodinGamers
0
done
Vox Codei - Episode 1
XP
+250 XP
Completed by 2,463 CodinGamers
0
done
Super Computer
XP
+250 XP
Completed by 5,101 CodinGamers
0
done
Roller Coaster
XP
+375 XP
Completed by 6,911 CodinGamers
0
done
Surface
XP
+250 XP
Completed by 4,803 CodinGamers
0
done
CGX Formatter
XP
+250 XP
Completed by 4,282 CodinGamers
0
done
Power of Thor - Episode 2
XP
+250 XP
Completed by 1,818 CodinGamers
0
done
There is no Spoon - Episode 2
XP
+250 XP
Completed by 1,520 CodinGamers
0
done
The Fall - Episode 2
The Fall - Episode 2
XP
+250 XP
Completed by 1,250 CodinGamers
0
done
TAN Network
XP
+250 XP
Completed by 2,543 CodinGamers
0
done
Genome Sequencing
XP
+250 XP
Completed by 4,027 CodinGamers
0
done
Blunder - Episode 2
Blunder - Episode 2
XP
+250 XP
Completed by 3,351 CodinGamers
0
done
Blunder - Episode 3
Blunder - Episode 3
XP
+250 XP
Completed by 2,095 CodinGamers
0
done
Puzzle of the Week
Let's make a cheap ASCII 3D engine!
by pardouin
Let's make a cheap ASCII 3D engine!
XP
+50 XP
Completed by 134 CodinGamers
0
done
Fold and cut
by NicknamedTwice
Fold and cut
XP
+50 XP
Completed by 12 CodinGamers
0
done
M.A.R.I. and the crazy factory
by nicola
M.A.R.I. and the crazy factory
XP
+50 XP
Completed by 22 CodinGamers
0
done
Rummikub 2
by jddingemanse
Rummikub 2
XP
+50 XP
Completed by 17 CodinGamers
0
done
Tetris Floor
by cedricdd
Tetris Floor
XP
+50 XP
Completed by 17 CodinGamers
0
done
Simple Pascal (PL/0) Compiler
by JDOnline
Simple Pascal (PL/0) Compiler
XP
+50 XP
Completed by 10 CodinGamers
0
done
Counter Attack
by The Capra Aegagrus Hircus 2000
Counter Attack
XP
+50 XP
Completed by 17 CodinGamers
0
done
The flight of birds
by Sirios
The flight of birds
XP
+50 XP
Completed by 11 CodinGamers
0
done
Breaking Bifid
by therealbeef
Breaking Bifid
XP
+50 XP
Completed by 32 CodinGamers
0
done
Mind Cracker
by Humanosaure
Mind Cracker
XP
+50 XP
Completed by 26 CodinGamers
0
done
Sokoban
by eulerscheZahl
Sokoban
XP
+50 XP
Completed by 125 CodinGamers
0
done
Derivative time !!! - part2
by pluieciel
Derivative time !!! - part2
XP
+50 XP
Completed by 41 CodinGamers
0
done
Advertisements
by jddingemanse
Advertisements
XP
+50 XP
Completed by 24 CodinGamers
0
done
Solve for X
by Timinator
Solve for X
XP
+50 XP
Completed by 25 CodinGamers
0
done
Picture Puzzle
by Teiglin
Picture Puzzle
XP
+50 XP
Completed by 45 CodinGamers
0
done
String Balls II
by Timinator
String Balls II
XP
+50 XP
Completed by 21 CodinGamers
0
done
Kakuro Solver
by Q12
Kakuro Solver
XP
+50 XP
Completed by 83 CodinGamers
0
done
Killer Sudoku Extreme Challenge
by Timinator
Killer Sudoku Extreme Challenge
XP
+50 XP
Completed by 27 CodinGamers
0
done
The Hidden Fortress
by pardouin
The Hidden Fortress
XP
+50 XP
Completed by 287 CodinGamers
0
done
Nonogram inversor
by LaurentBouvier
Nonogram inversor
XP
+50 XP
Completed by 123 CodinGamers
0
done
Conditional probabilities
by nicola
Conditional probabilities
XP
+50 XP
Completed by 55 CodinGamers
0
done
The Burglar's Dilemna
by [CG]Keelhaul
The Burglar's Dilemna
XP
+50 XP
Completed by 244 CodinGamers
0
done
Obsolete Programming
by Zorg1
Obsolete Programming
XP
+50 XP
Completed by 364 CodinGamers
0
done
Map Colorations
by DPAmar
Map Colorations
XP
+50 XP
Completed by 64 CodinGamers
0
done
8086 Assembler, part I
by JDOnline
8086 Assembler, part I
XP
+50 XP
Completed by 17 CodinGamers
0
done
Takuzu Solver
by vinc-r
Takuzu Solver
XP
+50 XP
Completed by 92 CodinGamers
0
done
Einstein's riddle solver
by OroshiX
Einstein's riddle solver
XP
+50 XP
Completed by 202 CodinGamers
0
done
ASCII Art QR code
by Eulero314
ASCII Art QR code
XP
+50 XP
Completed by 69 CodinGamers
0
done
DAWG
by Westicles
DAWG
XP
+50 XP
Completed by 56 CodinGamers
0
done
Strobogrammatic Numbers
by undefined
Strobogrammatic Numbers
XP
+50 XP
Completed by 41 CodinGamers
0
done
Factorials of primes decomposition
by nicola
Factorials of primes decomposition
XP
+50 XP
Completed by 216 CodinGamers
0
done
Her Majesty's well shared secret
by Niako
Her Majesty's well shared secret
XP
+50 XP
Completed by 94 CodinGamers
0
done
Hexagonal Maze - part2
by Remi.
Hexagonal Maze - part2
XP
+50 XP
Completed by 76 CodinGamers
0
done
Can you save the forest - Episode 2
by chabes
Can you save the forest - Episode 2
XP
+50 XP
Completed by 11 CodinGamers
0
done
11-puzzle
by [CG]Maxime
11-puzzle
XP
+50 XP
Completed by 191 CodinGamers
0
done
Zergling rush
by ValNykol
Zergling rush
XP
+50 XP
Completed by 669 CodinGamers
0
done
Thomas and the Freight Cars
by java_coffee_cup
Thomas and the Freight Cars
XP
+50 XP
Completed by 268 CodinGamers
0
done
Chess cavalry
by Arglanir
Chess cavalry
XP
+50 XP
Completed by 706 CodinGamers
0
done
Mars Colonization
by java_coffee_cup
Mars Colonization
XP
+50 XP
Completed by 193 CodinGamers
0
done
Turing machine
by ValNykol
Turing machine
XP
+50 XP
Completed by 690 CodinGamers
0
done
24: The Long Game
by jddingemanse
24: The Long Game
XP
+50 XP
Completed by 23 CodinGamers
0
done
Magic count of numbers
by InstouT94
Magic count of numbers
XP
+50 XP
Completed by 476 CodinGamers
0
done
The Total is Right - Weird edition
by Alain-Delpuch
The Total is Right - Weird edition
XP
+50 XP
Completed by 279 CodinGamers
0
done
Paper-folding curve
by java_coffee_cup
Paper-folding curve
XP
+50 XP
Completed by 504 CodinGamers
0
done
N Pearls Necklace
by pardouin
N Pearls Necklace
XP
+50 XP
Completed by 22 CodinGamers
0
done
The Empire Enigma
by ReMoD
The Empire Enigma
XP
+50 XP
Completed by 242 CodinGamers
0
done
Detective Pikaptcha EP4
by java_coffee_cup
Detective Pikaptcha EP4
XP
+50 XP
Completed by 199 CodinGamers
0
done
SHA-256 Hash
by schachmatt
SHA-256 Hash
XP
+50 XP
Completed by 147 CodinGamers
0
done
A Man with a Plan
by undefined
A Man with a Plan
XP
+50 XP
Completed by 82 CodinGamers
0
done
Apple tree
by input.txt
Apple tree
XP
+50 XP
Completed by 791 CodinGamers
0
done
Cloudy Weather
by Niako
Cloudy Weather
XP
+50 XP
Completed by 70 CodinGamers
0
done
Blockout
by eulerscheZahl
Blockout
XP
+50 XP
Completed by 13 CodinGamers
0
done
A Game of Go
by Tux4711
A Game of Go
XP
+50 XP
Completed by 233 CodinGamers
0
done
Chess board analyzer
by Di_Masta
Chess board analyzer
XP
+50 XP
Completed by 453 CodinGamers
0
done
Fractal Carpet
by Sethius
Fractal Carpet
XP
+50 XP
Completed by 391 CodinGamers
0
done
Doubly solved Rubik's cube
by icecuber
Doubly solved Rubik's cube
XP
+50 XP
Completed by 109 CodinGamers
0
done
Encounter surface
by BLANC
Encounter surface
XP
+50 XP
Completed by 140 CodinGamers
0
done
X egg problem
by Romario
X egg problem
XP
+50 XP
Completed by 217 CodinGamers
0
done
The Balanced Centrifuge Problem
by magaiti
The Balanced Centrifuge Problem
XP
+50 XP
Completed by 126 CodinGamers
0
done
The hungry duck - part 2
by schubc
The hungry duck - part 2
XP
+50 XP
Completed by 836 CodinGamers
0
done
Laser and mirrors
by Arglanir
Laser and mirrors
XP
+50 XP
Completed by 365 CodinGamers
0
done
Grid climbing
by Rafarafa
Grid climbing
XP
+50 XP
Completed by 52 CodinGamers
0
done
Jump Point Search - Preprocessing
by aCat
Jump Point Search - Preprocessing
XP
+50 XP
Completed by 99 CodinGamers
0
done
Breakout
by player_one
Breakout
XP
+50 XP
Completed by 80 CodinGamers
0
done
Misère Nim
by magaiti
Misère Nim
XP
+50 XP
Completed by 156 CodinGamers
0
done
Neighbor-Sum Grids
by Niako
Neighbor-Sum Grids
XP
+50 XP
Completed by 90 CodinGamers
0
done
Harmless Rooks
by Niako
Harmless Rooks
XP
+50 XP
Completed by 94 CodinGamers
0
done
Mini sudoku solver
by nicola
Mini sudoku solver
XP
+50 XP
Completed by 1,009 CodinGamers
0
done
Dumbbells solver
by VilBoub
Dumbbells solver
XP
+50 XP
Completed by 151 CodinGamers
0
done
Cryptarithm
by Bob
Cryptarithm
XP
+50 XP
Completed by 492 CodinGamers
0
done
Gerrymandering
by MathisHammel
Gerrymandering
XP
+50 XP
Completed by 246 CodinGamers
0
done
Maximising integers
by SubwayMan
Maximising integers
XP
+50 XP
Completed by 147 CodinGamers
0
done
Closest Number
by Nagrarok
Closest Number
XP
+50 XP
Completed by 135 CodinGamers
0
done
Max Rect
by java_coffee_cup
Max Rect
XP
+50 XP
Completed by 394 CodinGamers
0
done
Boggle
by Bob
Boggle
XP
+50 XP
Completed by 543 CodinGamers
0
done
Cheat Solving
by JBM
Cheat Solving
XP
+50 XP
Completed by 219 CodinGamers
0
done
Binary neural network - Part 1
by player_one
Binary neural network - Part 1
XP
+50 XP
Completed by 179 CodinGamers
0
done
Staircases
by sampriti
Staircases
XP
+50 XP
Completed by 391 CodinGamers
0
done
To Sky's Edge
by [CG]Keelhaul
To Sky's Edge
XP
+50 XP
Completed by 360 CodinGamers
0
done
Vortex
by MadKnight
Vortex
XP
+50 XP
Completed by 415 CodinGamers
0
done
Sliding Maze Puzzle
by pardouin
Sliding Maze Puzzle
XP
+50 XP
Completed by 18 CodinGamers
0
done
Binary Extension
by mouton5000
Binary Extension
XP
+50 XP
Completed by 63 CodinGamers
0
done
Order of Oopserations!
by Stashio
Order of Oopserations!
XP
+50 XP
Completed by 267 CodinGamers
0
done
Erdős Number
by Delgan
Erdős Number
XP
+50 XP
Completed by 207 CodinGamers
0
done
Monte Carlo Tree Search exercise
by aCat
Monte Carlo Tree Search exercise
XP
+50 XP
Completed by 201 CodinGamers
0
done
Binary Permutations
by TheNinja
Binary Permutations
XP
+50 XP
Completed by 321 CodinGamers
0
done
Castle Siege
by TheNinja
Castle Siege
XP
+50 XP
Completed by 333 CodinGamers
0
done
Kolakoski Sequence
by Orabig
Kolakoski Sequence
XP
+50 XP
Completed by 782 CodinGamers
0
done
Longest Palindrome
by Maurice_Moss
Longest Palindrome
XP
+50 XP
Completed by 823 CodinGamers
0
done
Discrete Log Problem
by Maurice_Moss
Discrete Log Problem
XP
+50 XP
Completed by 102 CodinGamers
0
done
Flower beds
by Fluxor
Flower beds
XP
+50 XP
Completed by 130 CodinGamers
0
done
Electrical grid
by qsantos
Electrical grid
XP
+50 XP
Completed by 308 CodinGamers
0
done
Connect four
by Bob
Connect four
XP
+50 XP
Completed by 411 CodinGamers
0
done
Sum of odd
by dwarfie
Sum of odd
XP
+50 XP
Completed by 232 CodinGamers
0
done
The hungry duck - part 1
by schubc
The hungry duck - part 1
XP
+50 XP
Completed by 1,069 CodinGamers
0
done
Three little piggies
by nicola
Three little piggies
XP
+50 XP
Completed by 39 CodinGamers
0
done
Hill Notation and Hill Order
by btharper
Hill Notation and Hill Order
XP
+50 XP
Completed by 262 CodinGamers
0
done
Parsing context-free grammar
by aCat
Parsing context-free grammar
XP
+50 XP
Completed by 114 CodinGamers
0
done
Execution Circle
by Skreamly
Execution Circle
XP
+50 XP
Completed by 282 CodinGamers
0
done
Hitori solver
by VilBoub
Hitori solver
XP
+50 XP
Completed by 135 CodinGamers
0
done
The Holy Grail
by Blem
The Holy Grail
XP
+50 XP
Completed by 501 CodinGamers
0
done
Hit the road
by mouton5000
Hit the road
XP
+50 XP
Completed by 195 CodinGamers
0
done
Dominoes solver
by VilBoub
Dominoes solver
XP
+50 XP
Completed by 144 CodinGamers
0
done
The Beautiful sequence
by dogther
The Beautiful sequence
XP
+50 XP
Completed by 246 CodinGamers
0
done
Spreadsheet Labels
by Porthos3
Spreadsheet Labels
XP
+50 XP
Completed by 685 CodinGamers
0
done
CG Chat Interpreter
by player_one
CG Chat Interpreter
XP
+50 XP
Completed by 115 CodinGamers
0
done
MAGICAL FROG
by berqiamouad
MAGICAL FROG
XP
+50 XP
Completed by 18 CodinGamers
0
done
Chess moves on FEN position
by scrauler
Chess moves on FEN position
XP
+50 XP
Completed by 317 CodinGamers
0
done
Mystery sums
by Neonox
Mystery sums
XP
+50 XP
Completed by 544 CodinGamers
0
done
Levenshtein distance
by Steuh
Levenshtein distance
XP
+50 XP
Completed by 634 CodinGamers
0
done
Legendary Archer Octavius
by UnicornP
Legendary Archer Octavius
XP
+50 XP
Completed by 20 CodinGamers
0
done
Pascal Trapezoid
by player_one
Pascal Trapezoid
XP
+50 XP
Completed by 138 CodinGamers
0
done
Elevator
by dimpopo
Elevator
XP
+50 XP
Completed by 1,155 CodinGamers
0
done
Simple CPU Emulation 1
by SunMan
Simple CPU Emulation 1
XP
+50 XP
Completed by 689 CodinGamers
0
done
TXT2HTML
by Merome
TXT2HTML
XP
+50 XP
Completed by 415 CodinGamers
0
done
Horn-SAT solver
by ludowsky
Horn-SAT solver
XP
+50 XP
Completed by 110 CodinGamers
0
done
Jump Point Search - Runtime
by aCat
Jump Point Search - Runtime
XP
+50 XP
Completed by 63 CodinGamers
0
done
Bailey–Borwein–Plouffe Pi
by Zenoscave
Bailey–Borwein–Plouffe Pi
XP
+50 XP
Completed by 65 CodinGamers
0
done
Hanoi tower
by Bob
Hanoi tower
XP
+50 XP
Completed by 519 CodinGamers
0
done
Hangman
by [CPC]glau
Hangman
XP
+50 XP
Completed by 784 CodinGamers
0
done
Wave Function Collapse (sans Shannon)
by Wontonimo
Wave Function Collapse (sans Shannon)
XP
+50 XP
Completed by 25 CodinGamers
0
done
Simple safecracking
by Shomz
Simple safecracking
XP
+50 XP
Completed by 1,485 CodinGamers
0
done
Google Interview - The Two Egg Problem
by [CG]OlogN
Google Interview - The Two Egg Problem
XP
+50 XP
Completed by 2,040 CodinGamers
0
done
n Queens
by VilBoub
n Queens
XP
+50 XP
Completed by 576 CodinGamers
0
done
Candies
by Elliot
Candies
XP
+50 XP
Completed by 582 CodinGamers
0
done
Balanced Levers
by java_coffee_cup
Balanced Levers
XP
+50 XP
Completed by 22 CodinGamers
0
done
Universe Conquest
by Enygma
Universe Conquest
XP
+50 XP
Completed by 136 CodinGamers
0
done
KGood
by _NikJ
KGood
XP
+50 XP
Completed by 581 CodinGamers
0
done
Symbolic system of equations
by izanbf
Symbolic system of equations
XP
+50 XP
Completed by 95 CodinGamers
0
done
Alternative vote
by [CG]Maxime
Alternative vote
XP
+50 XP
Completed by 480 CodinGamers
0
done
Simplify Selection Ranges
by xmetrix
Simplify Selection Ranges
XP
+50 XP
Completed by 1,902 CodinGamers
0
done
Code your own Automaton2000, step 1
by Magus
Code your own Automaton2000, step 1
XP
+50 XP
Completed by 187 CodinGamers
0
done
Divisibility of Fibonacci numbers sum
by OPi
Divisibility of Fibonacci numbers sum
XP
+50 XP
Completed by 110 CodinGamers
0
done
Inertia ride
by [CG]Keelhaul
Inertia ride
XP
+50 XP
Completed by 412 CodinGamers
0
done
Expand the polynomial
by nicola
Expand the polynomial
XP
+50 XP
Completed by 676 CodinGamers
0
done
Breaking Apart
by Gorbit99
Breaking Apart
XP
+50 XP
Completed by 66 CodinGamers
0
done
The max surface box
by VinceKanabo
The max surface box
XP
+50 XP
Completed by 546 CodinGamers
0
done
Rocket mice
by player_one
Rocket mice
XP
+50 XP
Completed by 94 CodinGamers
0
done
Nuggets numbers
by Thib34
Nuggets numbers
XP
+50 XP
Completed by 252 CodinGamers
0
done
Drawing Polygons
by PauloVilela
Drawing Polygons
XP
+50 XP
Completed by 414 CodinGamers
0
done
7-segment display
by scrauler
7-segment display
XP
+50 XP
Completed by 1,010 CodinGamers
0
done
Highest truncated pyramid
by TwelveOThirteen
Highest truncated pyramid
XP
+50 XP
Completed by 880 CodinGamers
0
done
The Highest Building
by Konrad_Wer
The Highest Building
XP
+50 XP
Completed by 416 CodinGamers
0
done
Adversarial Mate with Rook
by aCat
Adversarial Mate with Rook
XP
+50 XP
Completed by 17 CodinGamers
0
done
The greatest number
by Magus
The greatest number
XP
+50 XP
Completed by 3,543 CodinGamers
0
done
Tetris
by Bob
Tetris
XP
+50 XP
Completed by 212 CodinGamers
0
done
CG's Next Top Model
by Wontonimo
CG's Next Top Model
XP
+50 XP
Completed by 30 CodinGamers
0
done
Egyptian multiplication
by MoonCoder
Egyptian multiplication
XP
+50 XP
Completed by 893 CodinGamers
0
done
Musical Intervals
by JBM
Musical Intervals
XP
+50 XP
Completed by 140 CodinGamers
0
done
Timer for Clash of Code
by Lupilum
Timer for Clash of Code
XP
+50 XP
Completed by 764 CodinGamers
0
done
Snooker Ball Collision
by Loufouh
Snooker Ball Collision
XP
+50 XP
Completed by 34 CodinGamers
0
done
Wall Street
by MasterJos
Wall Street
XP
+50 XP
Completed by 163 CodinGamers
0
done
Pedestrian Traffic
by tobakudan
Pedestrian Traffic
XP
+50 XP
Completed by 25 CodinGamers
0
done
🃏 FreeCell 🃏
by JBM
🃏 FreeCell 🃏
XP
+50 XP
Completed by 5 CodinGamers
0
done
Test before Validate!
by bloublou
Test before Validate!
XP
+50 XP
Completed by 402 CodinGamers
0
done
Basic Decision Tree - 1
by Wei-1
Basic Decision Tree - 1
XP
+50 XP
Completed by 89 CodinGamers
0
done
Secret Message Decoding
by csKingBabar
Secret Message Decoding
XP
+50 XP
Completed by 11 CodinGamers
0
done
Basic Decision Tree - 2
by Wei-1
Basic Decision Tree - 2
XP
+50 XP
Completed by 36 CodinGamers
0
done
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