Drawin g on the blackboard isn’t always enough. Especially when you have to avoid dangerous obstacles and reach the end.
The game tests your memory and steady hand. You control a chalk and you have to move on the blackboard to reach the exit. But you only see the end. At first you see the whole place with all its traps and dangers but then is all black and you have to move according your memory. You just have a radar or a bulb to have some chance.