Congrats on your fun game!
I like the theme where it's like the number version of 'hangman' and Frederick deteriorates (or reveals his true form?) when the player answers incorrectly.
To be fair I got most of my correct answers through a process of elimination more than anything else due the game's multiple choice format. I think it would be impossible without the aid of those or indeed a calculator. But I didn't cheat with the calc - honest!
It was for sure 2D - don't think anyone could argue there and fits horror sublimely because everyone knows Math is the real horror and much scarier than what Frederick does. Although having said that, failing does bring a smile to my face when Frederick has his 'funny turn'. :)
Really fun and enjoyable browser game for some good ol' number crunching and some LOLs. Thanks for making the game and sharing!