A cranky genius scientist and his anxious grandkid Pip hop through portals to rebuild a shattered Portal Core while Mirror-Doc schemes against them. Blast six kinds of enemies across six absurd scrolling worlds, collect five fuel crystals in each, and face the Mega Clone boss. Chain kills, grab power-ups, dash through danger, charge a Reality Surge, and earn up to three stars per dimension. Story scenes and all six worlds are playable from the title screen.