Practice Mode

Practice Mode is a feature in Geometry Dash. It is designed to help the player learn the layout of levels, during which time they will not be forced to restart from the beginning in the instance of a crash. Instead, they gain the ability to place checkpoints, marked by green gems.

Description
Practice mode is enabled using the green gem button in the pause menu. By default, checkpoints are automatically generated every so often, although Auto-Checkpoints can be disabled from the pause menu. The last checkpoint placed can also be removed if inconvenient, where the player can then proceed from the previous checkpoint. This can be done as many times as required.
 * On a mobile device, buttons will appear that can be tapped to place and remove checkpoints.
 * On Steam, pressing the 'Z' key will place a checkpoint, while pressing the 'X' key will remove it.

Progress on practice mode is recorded separately from normal mode and does not offer the standard level rewards of secret coins or stars. However, other achievements will unlock as usual.

Trivia

 * Enabling practice mode will always change the soundtrack to an edited version of Stay Inside Me by OcularNebula and will continuously loop, even when the player crashes.
 * It takes 1 second to respawn after a crash. Enabling the Fast Practice Reset from the Options menu under Settings reduces the time to 0.5 seconds.
 * For the cube, ball, robot and spider forms, checkpoints will automatically be generated once connecting with a solid surface following a series of movements. For the ship, UFO and wave forms, checkpoints and are instead generated a set distance behind the player.
 * Secret coins and user coins cannot be collected in practice mode and will instead be passed through like decorations.
 * While practice mode is enabled, map components will not pulsate to the beat.
 * Cycles, xStep and Clubstep are the only levels that reward icons upon completion in practice mode.