Info:

mTD is a fairly standard fixed path tower-defense, with a decent load of turrets and upgrade options. Unfortunately, it lacks strategic depth. Fortunately, it's a decent idle game

Help:

• Mouse for just about everything.
• Q, W, E to place basic, fast and super towers;
• A, S, D to place multi-fire, freeze and poison towers;
• Z and X for bombs;
• N to send the next wave.