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Twix (Atari ST)

Twix Atari ST The emulator is booting (the display is the small monochrome monitor up right)


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Twix is an implementation of the board moving puzzle known as Khun Phaen Escapes, usually manufactured with wood pieces. On a 4x5 board there are ten stones. Four small 1x1 pieces, four 1x2 pieces, one 2x1 piece and a single 2x2 piece. The goal is to bring the large square to the opposite side, which seems to be impossible first, as there are only two free fields to move and rearrange the pieces. Indeed this puzzle is not trivial, the common solution takes 103 steps, the currently best known strategy 79 steps.

In the game Twix you have to move the stone from the left to the right by selecting the piece to move and then move it with the cursor keys. The implementation is quite special, as the game code itself is not executed as an Atari ST program, but as a program for the Hewlett Packard 48SX pocket calculator which is then emulated inside the ST game. This is visualized by a 48SX on the screen and all the action is only taking place in the small monochrome display of this picture.


Twix Atari ST This will not help me progress further
Twix Atari ST Further fiddling on the right side
Twix Atari ST The emulator is booting (the display is the small monochrome monitor up right)
Twix Atari ST Starting position: move the big large block to the right

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Technical features

Beside implementing an emulator for the HP 48SX calculator, the game also uses a 320x270 pixel screen by "opening" the usually black borders there (normal Atari resolution is 320x200). This is achieved by outwitting the video hardware and is rarely used in games.

Related Web Sites

  • Demozoo (Game information and download of the free game on the demoscene database.)
Jo ST (24071) added Twix (Atari ST) on Aug 22, 2015