The old, the older, and the less old.

grant2012.ccl: If I create any Chip's Challenge levels in the year 2012, they'll be in this set.

GRANTF.dat: These levels are extremely old. I'm partial to 13, 14, and 16, though.

Grant.dat: These levels were originally posted on pieguy's site. Now they're here as well. (10 and 13 are in CCLP3!)