NEW: Global leaderboard.<br><br>Sign in with Google Play Games and see how far you can climb. Your highest level reached now posts to a worldwide leaderboard — chase the top, or just beat your own best.<br><br>Sign-in is optional. The whole game still plays without it, offline, ad-free unless you tap for a hint.<br><br>Tap RANK to join.
Only the current version so far — new entries appear as the game ships updates.
Resolve the graph or the build burns. A logic puzzle about version conflicts.
