Rich in contextual alternates, Ammer contains about 1800 glyphs. Each character has multiple alternates. And a complex OpenType substitution feature makes sure that the same variant does not appear twice in a line.

As a special gimmick, the font contains a Tic Tac Toe game: To activate it, type a # and turn on stylistic set 20. Then use digits 1–9 for setting the naughts and crosses on their places.