IAPs disabled – Riddle of the century Review

I'm really enjoying these logic puzzles and wanted to purchase the "hundreds more" after the initial 20. However, the purchase option keeps returning an error, and the app page doesn't even list any IAPs as being available. It seems like this is an incomplete demo with no way to upgrade to the full game. If I could buy the full app, it'd definitely receive more stars, as the puzzles are challenging but fair and consistently engaging.
Review by JDubs07 on Riddle of the century.