The goal is to order the pins, using as few moves as possibles.
Each move reverses the order of pins, from left until the selected pin.
Number of pins: 5 to 10

Possibility to undo and redo all moves.
An algorithm can show a solution.

3D Gem Puzzle

Difficulty: middle

3D extension of the classic "Gem Puzzle", also named "15 Puzzle", which was born about 1870 in USA.
You play in a cube 3x3x3. This is therefore a 26 Puzzle. Try to make this game without computer !

Possibility to undo and redo all moves.

The Count Is Good

Difficulty: middle

Based on the popular French game show "Des chiffres et des lettres" which has been broadcast every day for 40 years.
The calculation part of the game, named "Le compte est bon", can be played by people aged 7 to 77 years.

An algorithm can indicate if the game is solvable, or in the other case, the best target number.
This algorithm can show a solution using the fewest equations as possible.
Possibility to set manually all inputs numbers and the target number.
Integrated helper: prime factorization (for 16 bits integers).

The Gasp Game

Difficulty: (very) hard

Each grid cell has two possible states : light or dark square box.
The goal is to have the dark squares so that each box grid has an odd number of dark squares around it.
Grid size from 1x1 to 32x32, with possibility to play in rectangles.

A very fast algorithm can show all solutions, or indicate if the game isn't solvable.
Possibility to show the algebraic equations system for each rectangle (or square).