@TH3_C0N-MAN - Very nice.  Which model was this based on?

I'm also curious

Great! (too large for 'my' max 4x5 project, but cool/useful!)

May I suggest you to post a photo depicting the missing UNICODE characters? (I/we might retrieve their codepoint, visually… if it's not something too fanciful or proprietary, of course.)

Thanks! I'm currenly on this list… Anyone can help!

Well, it took me a while…
(Hope it can help a little.)

[Update your list if it did.]

Bye!

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ℹ (PNG) {almost sure} [U+2139] 'INFORMATION SOURCE' (standard/serifed)

ℯ (PNG) {unsure} [U+212F] 'SCRIPT SMALL E' (loop lacking 'délié')
℮ {quite unsure} [U+212E] 'ESTIMATED SYMBOL' (erroneously italicized)
ℓ {very unsure} [U+2113] 'SCRIPT SMALL L' (too wide)

⁻¹ (PNG) ⚠ proprietary & NOT Unicode {2 chrs. – both already exist} [U+207B] 'SUPERSCRIPT MINUS' (common)
  + [U+00B9] 'SUPERSCRIPT ONE' (standard/sans)
₋₁ (PNG) ⚠ proprietary & NOT Unicode {2 chrs. – both already exist} [U+208B] 'SUBSCRIPT MINUS' (common)
  + [U+2081] 'SUBSCRIPT ONE' (standard/sans)
{There might be a few fanciful solutions as single-glyph pairs, e.g. in the mathematical or arrows ranges of Unicode(?)}

  (PNG) {superscript multiplication sign? superscript asterisk?}

ₓ (PNG) {almost sure – is the bar a command?} [U+2093] 'LATIN SUBSCRIPT SMALL LETTER X' (disambiguated/line above)
  (PNG) ⚠ proprietary & NOT Unicode {still not} '[MISSING] LATIN SUBSCRIPT SMALL LETTER Y' (disambiguated/line above)
{⊼⊽ [U+22BC] and [U+22BD] is one of several possible pairs with fanciful shapes and mapping}

ẍ (PNG) {fanciful} [U+1E8D] 'LATIN SMALL LETTER X WITH DIAERESIS' (circumflex expected!)
ŷ (PNG) {unsure} [U+0177] 'LATIN SMALL LETTER Y WITH CIRCUMFLEX' (standard)
ṕ (PNG) {fanciful} [U+1E55] 'LATIN SMALL LETTER P WITH ACUTE' (circumflex expected!)
{ⓧⓨⓟ [U+24E7], [U+24E8] and [U+24DF] might be used too, if you can afford the extra enclosed style without circumflex – is this sign a command?}

∅ (PNG) {almost sure – not the existing Ø (even ø)} [U+2205] 'EMPTY SET' (standard)

≎≖≬≭⋆⋇ {quite unsure} (PNG)

α (PNG) {was pretty sure too…} [U+03B1] 'GREEK SMALL LETTER ALPHA'
∝ {unsure} [U+221D] 'PROPORTIONAL TO' (narrowed loop)
  {quite unsure} [U+0018] 'CANCEL' <control> (wider second C, "CAN" recommended)
∞ {very unsure – it already exists} [U+221E] 'INFINITY' (cropped right end)
© {very unsure – it already exists} [U+00A9] 'COPYRIGHT SIGN' (cropped right end, too)

⏨ (PNG) {sure} [U+23E8] 'DECIMAL EXPONENT SYMBOL' (standard)

┘ (PNG) {quite unsure – I don't know your “fraction symbol”} [U+2518] 'BOX DRAWINGS LIGHT UP AND LEFT' (incorrectly subscripted)

ª (PNG) {sure} [U+00AA] 'FEMININE ORDINAL INDICATOR' (disambiguated/old/line below)

º (PNG) {sure} [U+00BA] 'MASCULINE ORDINAL INDICATOR' (disambiguated/old/line below)

  (PNG) {small multiplication sign? small asterisk? subscript asterisk?}
⁎ {likely} [U+204E] 'LOW ASTERISK' (standard in the middle)
※ {unlikely – it already exists} [U+203B] 'REFERENCE MARK' (incorrect without dots)

⇃↾ (PNG) ⚠ fanciful {2 chrs.} & NOT Unicode [U+21C3] + [U+21BE] HARPOONS WITH BARBS (overlapped/fused)
§ {very unsure – it already exists} [U+00A7] 'SECTION SIGN' (stylized without central 'loop')
∫ {unlikely – it already exists} [U+222B] 'INTEGRAL' (incorrectly straight ends)

You may need to contact Casio directly (or a dedicated forum of specific users)…

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Interesting retro game :-) (Key 4 = fr€€mium?-))

The "fraction symbol" may very well be 231F, bottom right corner—it's part of four brackets. The 12th symbol is most likely the currency sign, or 00A4. The small multiplication sign may be cross product, or 2A2F. Both Y's already exist: 0177 (circumflex), and 0233 (macron).

P.S.: The last character may be 294C, which is "up barb right down barb left harpoon."

I noticed you already have the currency sign, so, the only other character that looks similar to the image is 21D4, or "left right double arrow".

@TCWhite: Well done! (esp. 21D4/231F/294C – my local fonts are just incomplete, although I should have spotted the double arrow… :-))

@TH3_C0N-MAN: Now I quite understand the role of this fraction symbol that I must have forgotten (I never was into calculators, unlike 8-/16-/32-bit 'puters/code). Since your Casio models show legacy representations (i.e. old -and often big- ones, for the compatibility I assume), then there may be a few glyphs that were 'borderline' in the past (that is, not even pre-Unicode)… In these cases, you might end up to a conventional/fallback mapping (found on the web from your communities), even to a personal one (any free, even fanciful code point with some logic – only the shape would matter here, of course). Feel free to bump your page in our Live thread; this font looks already quite complete to my novice eyes. (Oh, b.t.w. I add it to my long list of low-res FS favorites, since it adds several US-ASCII 3x5 characters.)

Yes (still only a few dozens to be archived/reviewed/commented, and I'm done with FontStruct's related very low-res fonts/trials [for the only sake of my comparisons, since ca. 2013 at least]). I'll post some minimalist isometric voxel art soon (but not their fontstruction, I'm afraid).

All right, I was going to be offtopic! → Continued here… :-)

Yeah, the fraction symbol may be specific to the calculator. However, bottom right corner isn't techinically a bracket—it's part of the math symbols section, along with the ceiling glyphs. Also, 21D4 could be "between," which is 226C.

Actually, with a bit more research (perusing my font Dehuti, which has all the math symbols), I think 21D4 is actually 2AA4, or greater-than overlapping less-than.

Nice game! (I'd love to see more frames per second like this famous one…) Your font fits perfectly :-)