This is a bit of a deep cut, but when I was young I really loved playing BlockOut on the Amiga. Funny that the wiki doesn’t seem to mention the Amiga or the Atari ST versions. I’m sure there are more ports than just that.
It’s essentially 3D Tetris, and it’s done extremely well. You can start the game with a number of options like the size of the field (3x3, 4x4, 5x5 etc) and the depth of the field.
Most interestingly, you can choose the block types, from all flat shapes which is the easiest, to crazy 3D shapes that take a ton of practice to be able to use correctly.
Because it’s all 3D, you have 6 rotation keys, 3 in clockwise, and 3 in counter clockwise. Then you can move the pieces with the mouse, and drop with a mouse button.
It leads to a really simple learning curve, but affords a lot of skill and depth if you put in the time to get decent at it.