Mad scientists: beware. Popular 2D platformer League of Evil is available for free on the App Store for a limited time.
A traditional platformer with a retro edge, Ravenous Games's wall-jumping adventure sprang onto iOS back in 2011.
Cast as a gymnastically gifted special agent, you're charged with defeating a group of maniac scientists who have banded together to exact unspeakable horrors on the world's population.
En route to completing this mission, you must bound though over 160 levels of spikes, lazers, spikes, henchmen, and, of course, spikes.
Wearing its old skool heritage on its sleeve, the release of this Qi Top 5 title triggered an avalanche of positive reviews, with critics flipping out over the game's '90s stylings and expertly implemented controls.
If this sounds like your beaker of acid (we're all out of tea), head on over to the App Store and grab League of Evil while it's still free.
View the League of Evil video below...