Have fun There is no erase tool because fun stuff happens when you draw a shape imperfectly You can stop the simulation it will remain in the list and you can continue after new green flag or just say yes and make a new simulation Do not worry if the tick interval keeps increasing and the simulation is slower as the wait block waits the tick interval minus days since 2000 multiplication and subtraction is a timer but better so its not going to wait 10 seconds if 5 is lag and other 5 is wait block The ticks of life is based on the recorded screen so it doesnt work when recording is off The recording is not done yet as it kinda stops working after a couple hundred frames of recording due to the amount of data stored You can hold mouse down to speed up the replay to the limits if you have tick interval high