First idea: Run or get caught!

The game rules are simple, you need to press a button in order to keep your character running, every now and then the button will randomly change so the player needs to be aware of it, also there will be obstacles that you will either need to crawl or jump over it, failing this wont mean an immediate defeat but rather your character slowing down, it's not a race since it wont end with a finish line, the players are followed by a stampede of animals ready to tackle them off track if they slow down too much, also the character will get more and more tired forcing you to press the button even faster. The contest ends when only one player remains.

Rewards: 1st place 600 MGP with a bonus of 30 MGP per 30 seconds.
2nd place 450 MGP with 25 MGP per 30 secs survived.
3rd place 250 MGP with 15 MGP per 30 secs.
-4th place 100 MGP with 5 MGP per 30 secs.
5th place and below get 50 MGP 2 MGP per 30 secs.
thx your time and attention.