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This is Logic for Fun, Version 2.0 (beta), released in 2014.

Version 1 was made live in 2001. It was designed and written by John Slaney in 2000, and scripted for the public release by Kal Hodgson. It underwent a significant revision in 2007, with some new scripts by Matt Gray.

Version 2 retains much of the text of the puzzles and guide (albeit considerably edited) from Version 1. The back-end solver remains, with only minor modifications to the input syntax. The rest of the site was completely re-scripted in 2013-14 by a team of Daniel Pekevski, Nathan Ryan and Wayne Tsai.

Principal new features of Version 2 are: