The exp reward for the quest for which you need higher requirements needs to be higher. For example the reward for visiting the pool is only 100exp and 20 cash. It should be higher.
Level 35 : wait until the zombie reaches the second last glass platform and than shoot it so he walks into the fire. If the girl starts walking after the zombie than u need to shoot the first platform below her so she falls down. If she walked all the way to you, than you shoot the platform above the guy in a box, which is a machine. If the final zombie falls onto the machine, the machine breaks and electrocute him.
Yesterday I was level 49 and had like 80 quests. Today Im lvl 48 and I've only completed 64 quests. Everytime I close the browser and restart it, my progress is lost...
There's a bug with the gold alarm clock I think... I'm supposed to unlock it at 5 hours, but when I checked it at an hour and a half I already had it...