Purchase an OCTO Book (click here)!
OCTO Spectrum -- 60 Puzzles, from Easy to Very Hard
OCTO Reloaded -- 60 Puzzles, from Easy to Very Hard
OCTO Genesis -- 60 Puzzles, only Easy and Medium
OCTO Nemesis -- 60 Puzzles, only Hard and Very Hard
OCTO Unleashed -- 60 Puzzles, from Easy to Very Hard
OCTO Patchwork -- 90 Puzzles, mostly Easy and Medium
OCTO Fireworks -- 90 Puzzles, Medium to Very Hard
In Northern Virginia, OCTO books are available at:
Barston's Child's Play. 4510 Lee Highway, Arlington, VA 703-522-1022