Sorter for Etrian stratums. Pick what you've played, and hit the Start button.
Click on the stratum you like better from the two, or tie them if you like them equally or don't know them.
Keyboard controls during sorting: H (pick left) J (undo) K (tie) L (pick right) S (save progress).
Before sorting: S/Enter (start sorting) L (load progress).
1/2/3 always correspond to the first/second/third buttons.