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Crust is a 2D sandbox game.

The truths of Crust:

• The world contains blocks.
• Blocks are the main content of the world.
• A block is a regular grid of cells.
• Block cells are fly-weight objects.
• A block cell has a material.
• A block has position and angle.
• The mass and moment of inertia of a block are derived from its cells.
• A block has one physics body and one or more physics shapes.
• The world also contains fluids.
• The world also contains particles.
• A particle is a light-weight representation of a one-by-one block.
• Blocks emit and absorb particles.
• Particles are also used for magic.
• A particle is a quantum of matter, fluid or energy.

The truths of characters:

• A character is a circular object.
• A character has eight ray springs extending in his horizontal, vertical, and diagonal directions.
• A character may run while at least one of his three downward rays is intersecting another object.
• A running character will rotate so that his up direction becomes perpendicular to his velocity.
• The run force of a character is perpendicular to his up direction.

The notes of Crust:

• Allow all classes to use all items, but throw in some perks, e.g. alchemists have longer flight range with rocket boots.