Crippled by micro-transactions
The puzzle functionality works well. However, it becomes very difficult to progress in game because the "token" currency used for opening new puzzles is awarded extremely rarely in an obvious push to get you to buy them. Tokens auto-generate, but cap at 10. Many puzzles cost far more than 10 so this is of no help. Players are also goaded into sharing the game on social media in exchange for more of these tokens. I was even offered free tokens to leave an app review. It all felt very manipulative.
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Picture Cross, v1.3