1. Use your powers to ruin Spacemas for everyone!
2. Most of your abilities reduce Spacemas cheer directly or indirectly.
Vandalize, destroy Spacemas decoration, write rude graffiti.
Poison food, taint foods or drinks with deadly poison.
Murder, induces instant cardiac arrest.
Activate cloak, cloak for a limited amount of time.
3. Santa Claus is your nemesis. Do everything in your power to kill him.
4. Work together with other grinches if there are any. Do not attack them, you're on the same team!
For more information, consult the wiki