Game Guy's Roulette

Game Guy's Roulette
Appears in	Mario Party 3
Type	Game Guy mini-game
Time limit	10 seconds to select a roulette space
Music track	Game Guy Mini-Game
Music sample

Game Guy's Roulette is a Game Guy minigame found in Mario Party 3.

Gameplay

The player attempts to choose which area on the roulette wheel the Red Shell will spin into, with smaller areas being worth more coins. After the player chooses an area, Game Guy spins the shell around the roulette. If the shell spins into the area the player chose, their coins are multiplied by the number listed next to their choice. However, if the shell spins into a different area from the area the player chose, the player loses all of their coins.

Spaces on the roulette

• The green Koopa Troopa area contains six slots on the roulette wheel and doubles the player's coins.
• The dark-blue Bob-omb area contains five slots on the roulette wheel and multiplies the player's coins by four.
• The brown Goomba area contains four slots on the roulette wheel and multiplies the player's coins by eight.
• The light-blue Boo area contains three slots on the roulette wheel and multiplies the player's coins by 16.
• The pink Toad area contains two slots on the roulette wheel and multiplies the player's coins by 32.
• The red area directly in front of Game Guy (represented by a generic Shy Guy on the betting table icon) contains just one slot on the roulette wheel and multiplies the player's coins by 64.

Expected value

Let B be the number of coins bet and observe that there are 21 slots on the roulette wheel. The following table shows the EV for each area the player can choose.

Bet on	Expected value
	2B × 2/7 = 12B/21 ≈ 0.5714B
	4B × 5/21 = 20B/21 ≈ 0.9524B
	8B × 4/21 = 32B/21 ≈ 1.5238B
	16B × 1/7 = 48B/21 ≈ 2.2857B
	32B × 2/21 = 64B/21 ≈ 3.0476B
	64B × 1/21 = 64B/21 ≈ 3.0476B

Although betting on Koopa Troopa is most likely to earn the player coins in a single minigame, constantly betting on Koopa Troopa makes the player most likely to lose coins in the long run. Conversely, constantly betting on Toad or Shy Guy is a long shot in any single round, but it makes the player more likely to triple their coins in the long run.

In-game text

• Game Guy – "Place your bet, then make your guess. If the shell stops in the area you chose, your coins will increase according to the odds. If the shell lands in another area, your coins will be mine."

Gallery

Roulette tokens

• 

  Mario

• 

  Luigi

• 

  Princess Peach

• 

  Yoshi

• 

  Wario

• 

  Donkey Kong

• 

  Princess Daisy

• 

  Waluigi

Character icons

• 

  Koopa Troopa

• 

  Bob-omb

• 

  Goomba

• 

  Boo

• 

  Toad

• 

  Shy Guy

Names in other languages

Language	Name	Meaning	Notes
Japanese	ヘイホールーレット[?] Heihō rūretto	Shy Guy Roulette
German	Glücks Guys Roulett[?]	Game Guy's Roulette