YaK-1

The YaK-1 is the fourth plane in merge It earns 40 coins per second without upgrades, and can be very powerful in the early stages of the game. If your rank is not in the top 5000, buying a YaK-1 is almost always powerful, and golden boxes spawn them usually around planes 9-14. 3 rubies to buy one is still cheap, although it could be better to wait and buy it with coins.plane.