Var getter/setter example

When a user plays this level for the first time, the variable stage_1 will be set to 0.
That will cause the checkpoint to the left to be activated, and the adventure robot will spawn there.
If the player walks to the right, activating the ID field, the variable stage_1 is set to 1 and the level is finished. If the player plays the level again, stage_1 is still 1, which will cause the checkpoint to the right to be activated instead, causing the robot to spawn on the right side instead.