Without digging deeper into your code, presumably "cube[ i ]" doesn't point to any value at all, number or otherwise. When you call table.remove without a second argument (either passing nil or nothing at all), it will just remove the last entry from the table, and as such you get a situa...

The purpose of this for loop is to check when one of the entities (they're just squares that spawn on the left/right and then move to the other side) has fulfilled it's purpose of making it to the opposite side they spawned, and if so; delete them. --make loop go backwards so it doesn't error when o...