Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Oddly written but an intriguing ruleset

Ars Magicka is one of the more unique role playing systems I've read in that it isn't a lot of any one thing. It encourages multiple guides, as well as experiences. There's a wealth of information here though and I think you'll need to read it several times before getting the gist of it. The layout is strange and I found myself more than halfway through asking the question, "Yeah? But what do we DO?" There are plenty of rules but the structure is very vague, purposely I think, but it may be a blessing or confusing challenge for beginner groups.