Invisible City is at it again with a new free game: Schlock Attack, a two-player checkers variant inspired by the online Schlock Mercenary comic strip by Howard Taylor. In the variant, each player chooses a different character from the comic strip, with the choice of character determining special abilities and victory conditions. The game is completely compatible with the earlier Sluggy Freelance checkers game, Kiki & Bun-Bun.