I mentioned the be-the-bad-guy-kill-the-hero-dungeon-making-sim Yuusha no Kuse ni Namaikida before, but there weren’t many details about how it plays other than you use a pickaxe to do the dirty work. Watch Impress has more information about how the pickaxe is used. The premise of the game is really digging up soil. Specific patches of soil release slimes or magic purple flames. These can attack the brazen hero, but other monsters also eat these to grow. If you want to grow strong monsters you have to pay attention to the food chain and for your convenience the game has a Zugan mode that details what each monster enjoys to eat. Clever and players better read up on it or else this is going to happen.