The game currently features 19 maps (will be more) and several difficulty levels. Your enemies are 6 types of suillus, each have different attributes. You have 7 eyes with unique color in your control which attack suilluses on sight. Each eye has it's own abilities such as poison, slow down, penetration, increased radius of attack, increased attack speed and more. Eyes can be combined in many ways to make an ultimate weapons against suilluses. After completion of the level you gain polymers to buy different upgrades (mostly for eyes) on the global hell map and unlock next levels. The main currency on a level is soul shards and energy which is gained by processing the shards
To run MassloTD on high graphics settings your PC will require at least a 0MB GeForce GT 340 / Radeon X1900 GT with a Core 2 Duo E4400 2.0GHz or Athlon 64 X2 Dual Core 4200+ CPU. System memory required for MassloTD is 2 GB performance memory. To be able to run at all you will need at least 1 GB system memory. Recommended needs around a 9 year old PC to run.