Chalk

Walkthroughs
Mr. Peckerston has a video playthrough on YouTube which shows him achieve an S-Rank on every level:

u4jbPd30wHQ Level 1

IEWmec7zK5c Level 2

8P0kDYT0vLo Level 3

kHoSybQFtko Level 4

TJJPQ-Xs_PY Level 5

9yx1_J6dxtA Level 6