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

A 12 player, team based strategy game. Two teams of up to six players must battle to defeat each other’s base. 8 units, or Minions, to choose from with 3 unique skills each. Level up and upgrade during battle to turn your Minion into a deadly machine. Combine with your team-mates to launch synchronized attacks on the opposing team while avoiding theirs.
Controls: Use left mouse click to move and attack. Click on a skill to activate it, some skills require a target which will be indicated by a purple cursor. As you level up skills can be upgraded, look for the red upgrade buttons. Keys:
X – toggle camera follow off/on. Mouse Wheel – scroll up / down.
Space – center view on Minion. 1,2,3 – activate a skill. Escape – deselect skill, or stop unit. Enter – open/send chat.