Atomix (Mobygames entry), the brilliant molecule-building puzzle game released back in 1990 for the Amiga and the Atari ST, has just been re-released for the Nintendo DS. As a freeware retro-remake no less. It's still in (a very stable, fully playable, extremely addictive) BETA, mind you, and you should immediately download it from this place.
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Related Tags: Atomix, Free DS game, DS, Nintendo DS, Retro gaming, Nintendo, DS freeware, DS homebrew, NDS