If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Help Flippy through various obstacles along this really long road. Like seriously how does this mailman do it. But the game isn't about the mailman. Mailmen go through snow and rain, but Flippy needs your help to go through bikes and hot dog carts! Collect up-grades such as the spring, magnet, feather, and, of course, the grenade. But beware! If you collect enough grenades, he’ll turn evil. Try not to hit any of the other Happy Tree Friends characters in his flashback mode! Or hit them. Your call.