Game modes

Cataclismo features four game modes:

1. Campaign is the game's main story. Units, pieces and buildings are unlocked as the campaign progresses through missions and Military Capacity is upgraded via a Citadel improvement line. The Book of Insight is available. Each mission has different mechanics depending on the mission type.
2. Skirmish contains two missions that last 4 nights each: Forgotten Glade and The Torrents. Everything starts unlocked but needs a high enough Prosperity level and Military Capacity is upgraded via a Citadel improvement line.
3. Endless mode features procedurally-generated maps of the chosen terrain. Only the most basic units, buildings and pieces start available, with the rest having to be unlocked using points. Military Capacity is upgraded with points too. Progressively harder waves of enemies appear each night, with grant points. There are resource caches scattered around the map but the biggest caches are guarded by Broodnests.
4. Sandbox mode allows all buildings, units and horrors to be placed instantly and for free. There are no resources, maintenance or nights and there is a menu to enable invincibility or remove all horrors. Difficulty is locked to Normal.

Campaign, Skirmish and Endless mode feature five difficulty levels, which affect the health of horrors and units as well as the maintenance costs.

Difficulty	Horror health	Unit health	Maintenance	Shack citizens
Story	20%	200%	50%	5
Easy	50%	150%	100%	4
Normal	100%	100%	100%	4
Hard	150%	50%	100%	4
Extreme	200%	1%	120%	3

Feeble Vermin horrors do not increase their health beyond Normal like the other horrors.