Aliens stole your cows, and thus begins your classically-styled, point and click adventure game. My kids loved this. We played it together and pondered over the puzzles between play sessions.
Genre: Adventure.
Platforms: PC.
Difficulty: Requires lateral thinking, but figure-outable.
Age-related suggestions: Suitable for everyone, especially when playing together.
Consider consulting detailed reviews before purchase.
If Your Kids are Gamers ... 