Games can be used as speculative design to allow players to consider alternate presents and plausible futures. Speculative design uses fiction without commercial constraints to prototype possible futures through design fictions. Critical games have primarily critiqued current events or games themselves. Persuasive games can influence players through procedural rhetoric and by appealing to logic, credibility, and emotions, but should avoid reductionism and promote minor behavioral changes. Games as speculative design should enable consideration of multiple plausible futures through both narrative and simulation, be developed iteratively in an interdisciplinary way, and remain free of commercial influence.