Boo's Crystal Ball
Boo's Crystal Ball is an item featured in Mario Party 4. A player can use the item to summon a Boo to steal coins (for five coins) or a Star (for 50 coins) from an opponent. A Boo's Crystal Ball can be purchased at item shops for 25 coins or won in Mini Minigames. The player can punch and try stop the Boo from stealing coins by merely tapping 
rapidly; this fails to deter Boo from stealing coins (unless they have a Gaddlight, which scares the Boo away), but can lower the number of coins stolen. The minimum and maximum number of coins a Boo can steal is dependent on the turns in the match; the more turns that have passed, the more coins the Boo steals. The option to repeatedly tap is absent if Boo is stealing a Star. Players can also access Boo's Crystal Balls by visiting Boo Houses on boards; there is a maximum of one Boo House per board.
The Boo's Crystal Ball has the same gameplay effects as the Boo Bell from Mario Party 2 and Mario Party 3, but provides a more "realistic" view of the Boo attacking the targeted player, as opposed to the Boo attacking the targeted player's status panel as before.
GalleryEdit
Donkey Kong about to have his star stolen from the Boo
Wario about to have his coins stolen via Boo House
Names in other languagesEdit
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | テレサのすいしょう[?] Teresa no Suishō |
Boo Crystal | |
| French | Boo-Boule de Cristal[?] | Boo Crystal-ball | |
| German | Buu-Huu-Kristall[?] | Boo Crystal | |
| Italian | Sfera di Boo[?] | Boo sphere |