The best alternatives to Puzzle Pieces are Word Tetris, Tetris 99, and Unicorn.js. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
This is implementation of Tetris Game but using words. arrange letters and make english language words, once you have valid word, click on letter to score points. Game play video ==> https://youtu.be/qvoL5J-jsFA This is a PWA. Play and Have fun.
Tetris is going battle royale, with a new competitive version of the iconic puzzler called Tetris 99. Players in Tetris 99 will compete online against each other until there is only one survivor left.