Given the context ( ppsspp is clearly PPSSPP emulator), the likely plaintext is something like: where thmyl = they, lbt = have, rzdnt = a problem, ayfl = with, ly = (maybe “the”), ppsspp = PPSSPP.
t→g, h→s, m→n, y→b, l→o → gsnbo l→o, b→y, t→g → oyg r→i, z→a, d→w, n→m, t→g → iawmg a→z, y→b, f→u, l→o → zbuo l→o, y→b → ob p→k, p→k, s→h, s→h, p→k, p→k → kkhhkk
t (20) +13 = 33 mod26 = 7 → g h (8) +13 = 21 → u m (13) +13 = 26 → z y (25) +13 = 38 mod26 = 12 → l l (12) +13 = 25 → y thmyl lbt rzdnt ayfl ly ppsspp
Notice ppsspp is a known emulator (PPSSPP — PlayStation Portable emulator). The phrase might be: they have a problem with PPSSPP encoded.
Atbash each letter:
t→r, h→g, m→n, y→t, l→k → r g n t k → rgn tk not right. Try one key right: t→y, h→j, m→, (comma?), no.
If we assume it’s a simple substitution cipher (like Caesar cipher or Atbash), the most likely candidate is (A ↔ Z, B ↔ Y, etc.), since it often produces readable results from seemingly random letters. Step 1 – Apply Atbash to each word Given the context ( ppsspp is clearly PPSSPP
Reverse word order: ppsspp ly ayfl rzdnt lbt thmyl
So thmyl → gsnbo — not obviously English. So maybe not Atbash directly. Atbash each letter: t→r, h→g, m→n, y→t, l→k