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Probably multiple solutions, but this is what I did:

Roll right (gaining -4), up, and left. Keep rolling onto the + tile until you have only -1 left. Then go up (over the multiplication, making your total -3). Roll your die in a square in the space to the left of the + - sequence until 5 is facing up. Rolling to the right should land you with the correct sum (-3 + 6 - 2 = 1).

I also had an issue with the font.

This was the best score I could get. Simple but fun!  I will say, the "press any key to return to menu" bit didn't seem to work.

Don't love that the play button opens a link to another site without asking, but the game was fun!

Tic tac toe - on the inside, X always does the (mirrored) opposite of what you do as O. Outside you play as X, so you have to follow the rules and do the opposite of what O does. It's not really tic tac toe.

Pack spoilers, if y'all get stuck (Rot 13).
Level - Answer: clue to get to answer.

Starter Pack

1. Flame and Fuel - nfurf: punepbny + sver
2. Screw Me In - yvtugohyo: ryrpgevpvgl + tynff
3. Plug Your Nose - fzbxr: sver + nve
4. Take Me With You - gbepu: sver + fgvpx

Rough Stuff

1. Groundbreaking! - fubiry: jbbq + qveg
2. Hard to the Touch - obggyr: tynff + sver
3. A Man Tried to Flirt - qveg: jbbq + fgbar
4. A Beautiful Sight - pnpghf: sybjre + jrncba (r.t. wniryva, nkr - gel znxvat veba naq tbvat sebz gurer)

Hot and Cold

1. Take Me to Dinner - objy naq fcbba: pynl + jbbq
2. Plunge into the Sea - svfuvat arg: jngre + jver (ryrpgevpvgl + veba)
3. A Warm Weapon? - sver fjbeq: sver + fjbeq (fjbeq vf sbetr + fgrry, fgrry vf veba + sbetr, sbetr vf punepbny + pehpvoyr, pehpvoyr vf fgbar + pynl)
4. A Pretty Flower - pureel oybffbz: sybjre + nve

Wave Away

1. Waves Without Arms - synt: fgvpx + cncre (cncre vf chyc + nve)
2. More Waves - sbetr: punepbny + pehpvoyr
3. Climbing Walls - ivar: cynag + fgvpx
4. Toss Me Into the Sea - zrffntr va n obggyr: obggyr + cncre

Ingenuity

1. Melt at Your Touch - vpr: jngre + serrmre (serrmre vf sna + jngre)
2. See the Future - tynff: fnaq + sver
3. Corked and Crooked - sverjngre: obggyrq synzr + jngre
4. A Bolt Through Air - obj: jbbq + jver

clay + wood (clay being sand + water, sand being air + stone)

Rot13 hint - Vs lbh gnc gur flzobyf arkg gb gur sbhagnva, gur oybbq cnggreaf xvaqn ybbx yvxr yrggref...

Rot13 answer - Gnc, va beqre, gur yrggref bs "sberire."

Slight spoilers:

For anyone else who gets stuck at the bottom of the well (left path) -- the dots correspond to what you're supposed to do. Find a pattern, use trial and error. You're not done until you've picked up an item. 
You will have to backtrack.

Can... someone explain the "Nasca et al." blue dots illusion? What am I looking for?? The rest of the game's fun, but this has me stumped.