implementing an automatic solve-algorythm is a tough job.
I would be really impressed if you could realise that.

(a solver is needed anyhow for a hint system)

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html