Feed the cat.

It's hungry. It's always hungry.

Feed the Catbox, and it may grant you its blessing!

Feed junk items to the cat, and in return it will give you hairballs. Unravel those and out come goodies, including CatTowers and cat modules.

Everything has a value in Catlories, worked out from what it took to make, so a circuit is a better meal than a plate. Fill its belly and something comes back up. Then it needs a nap.

And sometimes it grows, eating whatever was standing where it wants to be. Cats don't warn you before they knock things over.

Mod adds

• Catboxes: 5 tiers, each one a better-looking (and fatter) cat, from a 1x1 basket to a 5x5 Golden Catbox.
• Hairballs: 5 sizes, unravelled by hand or in an assembler for a random goodie.
• CatTowers (beacons): 5 tiers, from the Scratching Post to the Cat Castle.
• Cat modules: speed, productivity, efficiency (and quality with the Quality mod), with no downsides. Cat modules only work inside a CatTower.

Settings

• Catbox growth chance (map): 5%, 10%, 20% or 25% per full belly.
• CatTower stacking (startup): one tower, vanilla, or full.

Multiplayer

Not tested, but should have no issues. Everyone needs the mod installed.