Following a short cut scene that sets up your homicidal killbot's back story, you're deposited right into the thick of the action. Controls are simple: the Tickler follows your cursor to move around, and clicking the mouse activates his retractable arms. Holding down the mouse button will keep his arms extended, and any enemy ensnared in his claws will be continually, er, "tickled" until they're no more. Destroyed foes yield cash that can be spent on handy Tickler renovations between levels, ranging from your standard-issue damage/armor/speed upgrades to peripheral weapons like projectile buzzsaws, lightning projectors, and of course the eye lasers no good killbot should be caught without.
23 levels of robo-tickling excitement await you, and while most of them don't provide too robust a challenge, there's the occasional bad apple that might elicit more than a couple of replays. Thankfully, the game graciously lets you hang onto whatever money you managed to score up until your demise, so you've got the chance to salvage some upgrades to get you out of your rut. There's also the "Zombie Mash," a survival mode where you see how many waves of the undead your souped-up Tickler can endure.
This is one of those games where you'll probably know in the first 10 seconds of playing whether or not the Tickler is your kind of heartless killing machine. There isn't a ton of depth to the experience, but there's a heaping helping of cartoony zaniness, and the rockin' soundtrack certainly adds an element of "extreme" to the marauding. The controls are easy, the gameplay is straightforward, and the humans look ripe for the robot definition of the word "tickling".