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And I do something similar in my fingertip, where any input ends the game with a simulated parser error message.

"onemover" by Andrew

include basic screen effects by Emily Short.

Obligatory Room Name is a room.

A window is scenery in Obligatory Room Name.

your-ending is text that varies. your-ending is usually "".

rule for printing a parser error when the latest parser error is the I beg your pardon error:
say "You can't think of what to do.[paragraph break]";
tryitagain;

rule for printing a parser error:
say "Oops! That didn't do anything at all.[paragraph break]";
tryitagain;

every turn:
tryitagain;

ways-to-end is a number that varies. verbs-guessed is a number that varies.

to tryitagain:
if your-ending is "":
say "Hm, that wasn't a very creative way to die. You need to do better! It's for the general good!";
otherwise if your-ending is a movetry listed in table of accomplishments:
choose row with movetry of your-ending in table of accomplishments;
if there is an achieved entry and achieved entry is true:
say "You already died that way. But I'll let you try again.";
otherwise:
now achieved entry is true;
increment ways-to-end;
if there is a verbguess entry:
increment verbs-guessed;
say "You found a new ending[if there is a verbguess entry], guessing a stupid verb in the process[end if]! That's [ways-to-end] found and [verbs-guessed] verbs guessed!";
otherwise:
say "BUG please mention [your-ending] to the author.";
now your-ending is "";
reset-any-globals;
wait for any key;
say "[story description]";
try looking;

to reset-any-globals:
the rule succeeds;

instead of taking inventory:
say "You realize you are broke. You die from shame.";
now your-ending is "wallet"

Rule for constructing the status line:
center "Fingertips Title Here" at row 1;
rule succeeds.

table of accomplishments
movetry achieved verbguess
"wallet" false
"xyzzy" -- 1

chapter xyzzying

xyzzying is an action applying to nothing.

understand the command "xyzzy" as something new.

understand "xyzzy" as xyzzying.

carry out xyzzying:
now your-ending is "xyzzy";
say "Well, I'll put something clever here eventually.";