diff --git a/extra/24-game/24-game.factor b/extra/24-game/24-game.factor
index f0d43bf66e..1e204630a4 100644
--- a/extra/24-game/24-game.factor
+++ b/extra/24-game/24-game.factor
@@ -1,8 +1,7 @@
 ! Copyright © 2008 Reginald Keith Ford II
 ! 24, the Factor game!
-USING: accessors backtrack combinators continuations io kernel
-math math.parser prettyprint quotations random sequences shuffle
-;
+USING: accessors backtrack combinators continuations formatting io
+kernel math prettyprint quotations random sequences shuffle ;
 IN: 24-game
 
 : nop ( -- ) ;
@@ -43,9 +42,9 @@ CONSTANT: (operators) { + - * / rot swap q }
     [ name>> = ] with find nip ;
 
 : get-operator ( operators -- word )
-    "Operators: " write dup pprint nl flush
+    dup "Operators: %u\n" printf flush
     readln over find-operator dup
-    [ "Command not found..." print get-operator ] unless nip ;
+    [ "Operator not found..." print get-operator ] unless nip ;
 
 : try-operator ( array -- array )
     [ pprint nl ]
@@ -53,10 +52,10 @@ CONSTANT: (operators) { + - * / rot swap q }
     bi ;
 
 : end-game ( array -- )
-    dup { 24 } = [
+    first dup 24 = [
         drop "You WON!"
     ] [
-        first number>string " is not 24... You lose." append
+        "%d is not 24... You lose." sprintf
     ] if print ;
 
 : quit-game ( array -- )