You need to control your boat with moving right and left to avoid from coming logs in the river, Try to don't touch to enemy boats (They are red and more powerful then you). Even this river is dangerous It is also possible to collect things that will be useful to you. This includes bullets to sink logs and enemy boats, and thorns to break logs! You can get different bonusses with different boats. Unlock boats with destroying logs and with getting better score. You also need to survive on rain, which is much more harder then sunny everything will be faster and you need to be quick if you don't wanna lose. Even if the rain comes randomly, you will be informed before it arrives. Good luck on the river!