Heroscape is a really fun (and complex)  board game where you build a huge battlefield out of hexogans.   Each player then chooses their figures to make up an army and fights the other players (the aim of the game is to wipe out the enemy’s army).

There are two master sets (rise of the valcorie and swarm of the marrow), lots of expansion sets, ten expansion waves, three giant expansions, four special terrain sets and one castle set.