Some updates may alter the way save data is structured! If you encounter any problems after an update, it is most likely due to save data inconsistencies. Go into settings > account, then delete your data.
GAME SETTINGS
Select gamemode:
Survival
Survive waves of enemies as long as you can.
Sprint
Last through as many waves as you can before time is up.
Sandbox
Give yourself items, summon enemies, change player attributes, no consequences!
Select mods:
Achievements and collection additions are disabled with mods. Mods are applied in the order they are chosen in.