You may use the Munchkin Bookmark of Board Game Geekery in any game of Munchkin or its sequels. It may be used at any time when you are in combat. You may use only one bookmark (of any kind) per game unless you change sex. If you change sex, you may use a second bookmark. You may not use more than two in a game, no matter what.
(1) Show everyone the bookmark so they can satisfy themselves that it is what you say it is, and that it is unblemished. It won’t be that way for long.
(2) When you are ready to use your bookmark, grab a pen and ask someone with a smartphone or fancy-schmancy digital watch to get a timer ready.
(3) Once the timer is ready, say “GO!” You have 23 seconds to write the names of board games that you own in the big blank space below. Each game gives you a +1 in this combat. Duplicates and expansions don’t count.
For more information: http://boardgamegeek.com/boardgameexpansion/24733/munchkin-promotional-bookmarks