Dungeon Defenders, Alchemical Laboratory, by Steven Carter.

For those that know this game, you will already know this map. For those that don’t, you should. Then you can know the map. Dungeon Defenders is a mashup of third-person action RPG and tower defense genres. This is one of the simpler maps available. I’ll explain what you are looking at.

The red half circles are the spawn points where the monsters come from. You must defend the purple crystal from said monsters. To do that, you collect mana (yellow chests) and from dead monsters. With the mana, you build defenses, upgrade them, heal yourself, and perform special abilities. You build them along the path the monsters walk, noted by the red arrows. And that is basically the extent of the game. It’s insanely addictive because of the persistent leveling system and cooperative gameplay and tons of loot. Which brings me to the blue and yellow structure by the crystal. That is your forge, where your items are stored and you can upgrade your armor and items and such. 

With that being said, I played this game just today. It’s really new (you may have seen it in the Steam sales this holiday season), but I can remember enough to draw the map from memory! It has sucked up more time then any other game (162 hours as of today), since it was released in October 2011. Highly recommended.