Heidi Shadows is a secret ninja character that sells you cheats. She can be found southwest of Imperial Estates on Mondays (11 p.m. to 12 a.m.) and in the northern corner of the Park Maze on Fridays (3 a.m. to 4 a.m.). Mondays are days 1, 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 120, 127, 134, 141, 148, 155, etc. (every seven days). Fridays are days 5, 12, 19, 26, 33, 40, 47, 54, 61, 68, 75, 82, 89, 96, 103, 110, 117, 124, 131, 138, 145, 152, 159, etc. (every seven days). She will sell you cheats that can save you a lot of time on getting skill points. When you find her south of Imperial Estates, buy from her, and do not leave so that she dos not disappear. Buy out her shop, then wait until after 1 a.m. and go to her again. She will be completely restocked.