This loader was found in both Pulsar II and Worm Wall. According to Softalk July 1981 (page 51), "There are some good innovations on this disk. Pulsar II is accompanied by a second game, Worm Wall. Scores of the two games can be maintained cumulatively, so that you can finish a level of one, move to the other for a level of it, then go back to the first game for the next level".

The original 1981 Pulsar II title screen is found in the woz-a-day crack.