You’re in the zone on your favorite puzzle game, carefully disassembling a level that has perplexed you for days. This time, you catch the false move that would have doomed you before you commit to it, and a moment later, you finally seize sweet victory! “You beat level 12! Share your accomplishment on Facebook for a free coin booster!” If you’ve played free-to-play mobile or browser games, you’ve seen this for sure.