Nintengo 13 - Merge to 13

Can you merge same numbers to reach 13?

Every step is challenging because there is no extra space,
You must watch carefully the three numbers that will drop down.

Game Features:
- You have five opportunities to undo.
- Games will be saved automatically so that you can resume games at any time.
- Nintengo 11, 12 and 13 share same game rules and leaderboards. But they are pretty different in difficulty and feeling, and require different game strategies.