Woop is a puzzle-loving purple alien who has recruited Chuck Sommerville to build a universe of challenges for him to escape. You guide Woop through scrolling levels filled with blocks to shift, keys to find, switches to flip, water to cross, and lava to outmaneuver — while avoiding a persistent army of creatures determined to make a meal of him. Chuck's Challenge 3D 2020 is the expanded and updated version of the original, with new modes and refined puzzle design.