The Tower is a defence game. You stack up defensive blocks and use spells to protect your main heart block. I suggest normal difficulty first, if you find that too hard after a few goes trying out different strategies maybe drop back to easy. Rich mode is just for mucking around at the start to build a tower however you want. Only play this after you've played the game properly.
Controls:Mouse for blocks/spells
0-9 For selecting blocks/spells