Update README.md

2022-02-24 22:05:57 +02:00 · 2022-02-24 22:05:57 +02:00 · 2c2e5fa75b
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 hello DOSdl
 ===========
-Hello DOSdl is a variant of Wordle / hello wordl for MS-DOS running on IBM PC
-compatible systems.
+Hello DOSdl is a variant of Wordle / hello wordl for MS-DOS 1.25 and later.
+
+Gameplay
+--------
+Gameplay is as in hello wordl's default daily mode. `x` under a letter marks it
+as incorrect and `^` marks it as being in the wrong place.
+
+Missing features
+----------------
+
+- Ability to set the seed manually
+- Hard and extra hard modes
+- In-program help
+- Display of letters that have not been ruled out

 Word lists
 ----------