Full fart meter
Shrek's fart meter usually refills gradually over time. Farts are the main way to gain experience points. To refill the meter instantly, advance the time on your device by a few hours. Afterwards, set the time back to its correct value.
Full rest
Allow to let Shrek sleep once in awhile. When you put him to bed, he will remain there and rest while you are online or offline. To have him fully rested instantly, advance the time on your device. Afterwards, set the time back to its correct value.
Gems
Gems are the game's premium currency. Go to Rumpelstiltskin's store and select the first option to watch advertising videos and earn free gems. You normally need to wait some time to watch another video. However, you can close the app, then log in again. Go to the store again and repeat the process.