Same Name
A name you can already read in one script unlocks the same symbols everywhere else.
Three Egyptian royal names, each written inside a ring of signs, each with the Greek spelling beside it. You give a sound to a sign — and that sound then appears in every name that uses the same sign.
That is the whole trick. Read PTOLEMY from the Greek, and four of its signs turn up again inside CLEOPATRA, already read, before you have started. The signs you win in one name are the signs you spend in the next.
The last puzzle leaves two signs unread, and they are drawn to look almost the same. Only one of them also stands in Ptolemy's name. Pick the wrong one and Ptolemy stops spelling Ptolemy, right there on the board — so you decide not by which sign looks right, but by which reading keeps every name correct at once. Nothing is ever stuck: any sound can be taken back off a sign.
About the pictures. The shapes in this game are simple stand-ins, not real hieroglyphs, and you will not be able to read a real inscription with them. The history is real: Ptolemy and Cleopatra genuinely are the pair of names scholars compared, and matching the signs they share genuinely is how the sounds were fixed. Real Egyptian was harder still — the same sound could sometimes be written with more than one sign, which is part of why it took so long.