Unlike their PC and console predecessors, realtime interaction in social/online games and smartphone/tablet games is comparatively rare, due to both technical and design constraints. This is particularly ironic given that many social games are therefore not truly social, and the phones we carry around to connect to other people are mostly used to play single-player games. But realtime interaction is gradually coming to these platforms and can provide great new opportunities to connect players in real time across these platforms. This session will talk about design constraints and opportunities for applying realtime gaming across platforms.