Press F2, enter a cheat and press ENTER then F2 to activate. Sounds fun? Try it on a friend.

Gun auto-sighted ... r3sightin
Animals do not flee ... r3nofear
No noises ... r3damper
Large animals appear ... r3monster
Less animals appear ... r3plague
Go to the nearest animal ... r3find
Display all animals (map) ... r3showme
Hunter never tires ... r3homegym
Snowy weather ... r3blizzard
Icy weather ... r3ice
Rainy weather ... r3water
Lightning ... r3zeus
Thunder ... r3thunder
Reset time to noon ... r3noon
Flight mode ... r3skyhook
Go through fences ... r3truck
Bullet view ... r3leadeye
Alter slope effect ... r3climber
Super gore mode ... r3f13
Attract animals ... r3beacon