Void Block

Void blocks are total black blocks that you can pass through. There are also solid void blocks, which can't be passed through.

Next Spawner

The next spawner is the core of the game, located at the end of each room to spawn the next one. When the new room is spawned, the next spawner blends in and turns into a block near it. It is creative only, unbreakable and uncraftable. It also has a fake variant, which kills the player.

Servers

Servers are unbreakable, uncraftable creative-only blocks which come in 5 different variants which can be checked by hand: Offline, No Response/Unknown, Operational Success, Partial Operational Failure, Operational Failure, Online/Stable

Metal Blocks

Metal plates, grates, doors, fences, gates, buttons, walls pressure plates, trapdoors (and lamps) are creative-only unbreakable building blocks that make up the whole game. They are totally uncraftable.

Note: Initially the metal plates were only 26, but 1.0 added 25 more, making 51 metal plates in total.

Glass

Glass is a creative-only semi-transparent block that can be seen through pretty easily. It's unbreakable and uncraftable.

Containers

Containers come in 4 different styles, each style coming in 3 different variants: small, medium and big. The small containers have 9 slots, the medium 18 and the big 27. They are creative-only, unbreakable and uncraftable.

Entity Portal

The entity portal is an unbreakable and uncraftable creative-only block that, each random tick (default: 3 random ticks in a second) performs an action. These actions could be moving around (only if the block next to it is air) or spawning an entity.

Document Machine

The document machine is a block that can be used to spew out a random document, then it stops working. To fix it, use a sticky material on the cogs to make them work cleanly again. It is creative-only, unbreakable and uncraftable.

Pillows

The pillows are half blocks with wool textures coming in three different variants: white, normal (gray) and black. They let the player sleep. After sleeping for a random time, the player will wake up and get healed by an amount. If the player is sleeping on a white pillow, the amount will be between 1 and 2.5 health, with a 1 in 75 chance of spawning in a Ghost. If the player is sleeping on a gray pillow, the amount will be between 1 and 5 health, with a 1 in 50 chance of spawning in a Ghost. If the player is sleeping on a black pillow, the amount will be between 1 and 10 health, with a 1 in 25 chance of spawning in a Ghost. Pillows can be broken and brought around, but they are uncraftable.

Planks/Pallet

Planks are wood blocks that come in different variants. The weakest base one is just normal planks, made from wood. Then there's sturdy pallet, which is made from normal planks and a rock. Planks can be used for fuel, but sturdy pallet cannot. There are also doors and trapdoors both in planks and sturdy pallet.

Stalatin & Stalatin Blood

Stalatin is a jelly-like block that can be broken, but doesn't drop anything. The correct way to use it is either shooting at it or making it explode. At that point, it releases stalatin blood, which heals the player at touch.

Mannequin

NOT TO BE CONFUSED WITH MANNEKING

The mannequin, while it is technically an entity, is always perfectly still, so it can be considered a block. It is uncraftable, but it can be "killed", obtaining the item that spawns it. It does not do anything.

Acid & Toxic Cloud

Acid is a fluid block that spreads very fast. When touched, it rapidly corrodes what's in it and drains its health. The toxic cloud is like acid, but gas, and it only works one time. It's transparent, you can pass through it, and when you do, it burns you and drains the same health as acid, then disappears. Toxic clouds can also be destroyed by right-clicking them with an axe.

Tesla Liquid

Tesla liquid is a fluid block that inflicts anything trying to go for a swim in it with the Conductive effect (forever until death), which makes the poor victim randomly spawn lightning bolts. The Tesla liquid is the most annoying thing in the whole mod.

Water

It's water. It's not water from the vanilla game, but it has the same features.

Sign

The sign is an unbreakable and uncraftable creative-only block that comes in different variants, each containing a drawing or text.

Card Slots

Card slots are unbreakable, uncraftable creative-only blocks which come in different variants. These are used for powering things using specific types of cards.