A uniquely challenging puzzle

Key90 is an absorbing, highly addictive, logic puzzle and excellent brain-food for anyone who enjoys a challenge.

The unique features of Key90 which make it stand out from all others of its type are:

There is only one solution per puzzle.
The puzzles are highly addictive.
No two puzzles produced are ever the same.

You'll only need logic, not maths, to solve these intriguing brain teasers. Suitable for all ages from kids to teenagers to adults. Great for stimulating the mind and keeping your brain active as you get older.

Order an excusive compilation

The puzzles are available in an exclusive collection of six volumes, each containing 90 unique puzzles plus the answers. Each volume is available as a printed A5 size printed booklet or as a printable PDF file.

Get a free sample

Download the free Key90 logic puzzles ebook now. It includes the three puzzles plus the answers to give you a taste. Click here to go to the download page.

Made in Australia in 1982

Invented by Lawrence Gould in 1982, Key90 (or Unisol as it is also known) has been printed in the Sydney Morning Herald (Australia), Tele Sept Jeux (France) and occasionally in Paris Match (France) since the mid 1980s.

"For some years now I've been exercising my mental abilities in solving KEY 90 puzzles. My present challenge is to find the quickest or shortest way to a solution."

About Key90 logic puzzles Puzzle rules Buy ebooks Buy printed books Free sample

www.key90.com | www.unisol-puzzles.com

Mail: PO Box 61, Mt Victoria NSW 2786 Australia | Email: puzzles@key90.com