This variation is for both NTSC and PAL as there is no difference between the two on the Intellivision Video Game Console.

Excessive leeching is not permitted. 

The game-play is extremely slow on the first few levels so it may take some time to clear the first few screens. 

The player must be advancing through the screens in a reasonable manner. If a player stays at the first few screens for an unreasonable amount of time in order to accumulate treasures (and points), the player's score will be invalid. 

If a player hangs around on later screens after killing-off two enemies in order to accumulate points while there is only one enemy left on the screen, it is also considered leeching. Give the player the benefit of the doubt with respect to leeching.