Common builds, each a few calls on top of the other pages.
A top-down world. Set the world def's gravity to zero, give bodies linear and angular damping in their defs for the drag a top-down game wants, and drive characters with the mover kit or with velocities set each step.
A platformer character. The character is a capsule the game moves, not a body: each frame, m2World_CollideMover gathers the planes, m2SolveMover resolves the wished move, and m2ClipMoverVelocity spends the velocity (Events and queries). Jump by setting the vertical velocity, and let one-sided chains be the one-way platforms. The testbed's platformer is this recipe end to end.
A vehicle. A chassis body and two wheel bodies, each joined with a wheel joint, whose suspension spring is built in. Enable the wheels' motors and drive the motor speed from input. sample_car is the two-wheel version.
Destructible geometry. Run a sprite's outline through m2DecomposeOutline once to get convex pieces, and build the body from them. When it should break, call m2Body_Shatter with the same pieces: the body becomes one fragment per piece, each moving with the parent. An m2World_Explode at the impact point gives the shove (Bodies and shapes).
Water without particles. Place a water volume over the region and set its surface: light bodies float and dense ones sink. Give it a flow for a current, and move the surface for a tide. Reach for a particle pool only when the splash matters (Fluids).
Lockstep multiplayer. Every peer runs the same world from the same def and applies the same inputs at the same step. Exchange inputs, not state; compare m2World_Hash now and then, and on a mismatch compare m2World_GetHashParts to find the subsystem (Rollback and replay).