I just got a GBA cartridge dumper and flasher, and one of the first games I tried to flash to a cartridge was a fan-made Tetris clone called Apotris, which has ended up being the most fun I've ever had playing Tetris.

The official GBA version of Tetris is Tetris Worlds, and it kinda sucks. It was the first Tetris game to follow "The Tetris Guideline", which means it has gameplay additions like T-spins and holds, but the control feels subtly stiff. Visually, all of the budget went into extremely dated prerendered 3D backgrounds. Plus for some reason my cartridge won't save my settings. The one silver lining is all of the alternate modes exclusive to Worlds, but many of those are also ill-conceived and clunky.

As usual, the fans outdid the company. Apotris has a beautiful, incredibly flashy and stylish look, with lots of screen flashing, shaking, and neon colors. It also implements the Tetris Guideline, but with controls that feel way more fluid and naturalistic. And there are tons of theming options and gameplay tweaks to obsess over. The alternate game modes aren't as quirky as Worlds's, but represent the most popular and well-refined game modes in Tetris, all implemented competently.

So yeah. Best version of Tetris I've played, and it runs on my favorite game console of all time too!