Oh, and when not visible (such as being behind a wall or too far away), set the entity's my.invisible flag to on to prevent the engine from rendering it. I have tried and tested a code for doing this and it works well and the impact is very noticeable.
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials
