Your final answer should describe the legibility of this puzzle.
To start off,
Alright, those seem important. But what about the other side?
This leads to the main aha moment of the puzzle:
The top left can be cut up the same way too -- but parts are being obscured by the number squares at the bottom! So the second and third letters of the first row are 8 (rotated) and 9; on the far right of that row, we have 7, but it's been rotated and color-flipped.
The colors help us disambiguate some identical-looking numbers, like 2 and 5, and 1 and 4. (Though 6 and 9 aren't disambiguated.)
Now the clues make sense - they're giving hints as to what's underneath the squares. For instance, the second row is pretty readable already as
D?E[L/C][S/J]: given the clue "USES A FOIL", the answer must be
So we can fill in DUELS, using the font on the right as a reference for the "official" letter shapes.
Then we can continue, and reveal what was previously hidden:
The answers to the clues are
There are a few ambiguities in the tiles (which is 6 and which is 9? is 8 rotated or flipped?). But these can all be resolved, since all but one option for each will give you a non-letter.
So, the legibility of this puzzle is: