Pentagram is the 142nd level in Chip's Challenge 1. As pointed out in the level's hint, Pentagram contains a pentagram which is inscribed in a circular rectangle inscribed in a circle. It is also a recessed wall maze, which makes it a bit tough.
The route through the pentagram is R 3U RU to chip 3, then east to a chip, west, 2U and west, south to that chip, north, R and north, and then around the edges for two more chips; the ending chip is just above the exit, and will be directly standing in the way when Chip moves R 2U from his ninth chip.