This game is like a Jigsaw puzzle.
Fill the Board on the top left of the screen with symbols to win.
There is only one possible place for each symbol. All games starts with an "already found" symbol.
In the above example, the symbol "number 1" is already found.
You can collect "Ad coin" when you win a game, you lose some when you lose or quit a game.
Then, you use your "Ad coin" to unlock game mode.
Watching advertisement with this button before a game provide also some "Ad coin" as reward.
New high score in hard mode in top 10 Google Leaderboard (means you have internet and don't play as anonymous), can provide you an amazing number of "Ad coin"!
Warning: as requested in Europe (GDPR), each player has to agree (on options screen) to look at advertisements.