Only game with the option to have no enemies/obstacles?
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Published on ● Video Link: https://www.youtube.com/watch?v=uzbw6XU1h70
Park Patrol for the Commodore 64. All you need to do is pick up litter. Also you can make the plant grow from level 1, finish it with the start of level 2 (which allows you to run for a short time), making a level speedrun out of it, too.