Here is a short summary of each game (except Coding Awbie, Coding Jam, Monster and Numbers, which are at this time only for younger kids) and how they can be used by high school students.
Tangram has a Hard and Harder levels that are great for high schoolers (and even college students!). There are 600 puzzles for students to solve with either very few hints or no hints at all. Because these are puzzles, they help build logic and problem-solving skills for students.
The first third of Newton will be fairly straightforward and easy. But the rest of its levels (there are 60 in total) are very challenging and fun. Newton also helps build logic and problem-solving skills, as well as some engineering creativity! We've had older test users come up with very interesting ways to beat Newton.
The 'Hard' and 'Impossible' levels in Words are really challenging for ages 12+. We've had many high school and college students get very active and competitive! Think of Words as a combination of iSpy and Hangman. Students use critical thinking to guess the word and also have to race each other to spell it. Additionally, there is a web tool where teachers can create customized Words games using their own photos and word choices. Teachers have found this feature extremely helpful for vocabulary review and spelling games. Plus, of course, Words is great for learning foreign languages.
Masterpiece is truly an all-ages game. Toddlers to adults love it, whether it's drawing cartoon characters or intricate architecture. A popular hit has been self-portraits. Some additional uses are tracing Chinese characters, cursive letters, and sketching with watercolor painting.