|  Brain Teaser | | Title: | Brain Teaser | | Category: | Game/Logic | | Release Date: | 2026-05-20 | | Language: | English | | Size: | 16K | | Machine: | PAL & NTSC | | Code Type: | Basic | | Distribution: | Freeware | | Game ending type: | (n/a) | | |  | | Code by: | yevrowl | | Notes: | Compiled for several different systems. Based on the original BrainTeaser, created in 1993 by Wim Nijland on OS/2 Warp, while the game's concept was already known: see Brain Teaser, from the book Games Apples Play (1983), page 151, ported on C64 in 1984. |
External links:
MSX release
ZX Spectrum release
SourceForge
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| | Description | Brain Teaser is a single-player logic puzzle played on a 3×3 grid of nine cells numbered 1 through 9. Each cell is either visible (its digit is shown) or hidden (the cell appears blank). At the start of every game the visibility of each cell is randomised — except that the game guarantees the board is never already fully hidden.
Pressing a digit key always causes its own cell to become hidden and toggles a set of neighbouring cells: a visible neighbour is hidden; a hidden neighbour becomes visible again. If the selected cell is already hidden, nothing happens. Every move is permanent.
Corner rooms affect three adjacent rooms, side numbers affect two adjacent numbers on either side, the central cell affects four adjacent cells horizontally and vertically.
The player wins if all the numbers but the 5 are displayed. The player loses if the board gets cleared.
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| | Instructions | | Keyboard |
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| 1-9 | Apply the reaction for the corresponding digit | | Y | Play again (when asked) | | N | Exit from game (when asked) | | Esc | Quit the game immediately |
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