Squarez Deluxe

Originally a paid DOS game and the developer is a cool dude who changed it to freeware. You can download it on myabandonware or archive. Then grab a free copy of DOSBox.

In my view, it is the best shape packing game ever made, and it never really got its due, possibly in part to somewhat extra complexity, and partly from the time it came out.

You learn the ropes in the early modes, but you really need to play on EXTREME Mode. There are many different special pieces, and you decide how to move them in the playfield and rotate them.

There are mud traps and acid pits and missiles and bombs and traps. And you have to not only play the shape packing aspect, but you have to continually think about how to deploy these hazards, to your best advantage, or least disadvantage!

Over the years, I continually come back to this game, and I have probably sunk over a thousand hours since I was young.