The trouble is that on their way are obstacles. In order to continue their journey, it will be necessary to help them jump over and under each tombstone without touching them. The slightest shock and it will start all over again from the starting point.
Throughout your journey, you will accumulate, in your chest, massive gold coins that will allow you to unlock one by one the different zombies available to play. It takes patience and skill before having all the characters unlocked.
Each character can jump as many times as you want to never touch obstacles and collect bonuses. But be careful of your jump bar. It will serve you to jump as long as it is not empty. If this is the case, it will inevitably fall.
Show just agility and you'll score a big score!