Players can collect various items from the Mario universe. Press the A button when next to the item to trigger its special action.

• brick block
• cannon - shoots a Bullet Bill
• coin - makes Super Mario Bros. "coin" noise
• fire bar - continuously plays SMB castle theme*
• fire flower - plays fireball sound effect
• flagpole - plays down the flagpole sound effect from SMB
• green pipe - plays "entering a pipe" sound effect; Piranha Plant moves up and down inside pipe
• koopa shell - plays the shell-kick sound effect
• 1-up mushroom - plays 1-Up theme as "1UP" text floats above it
• ? block - plays vine growing sound effect
• starman - plays invincibility theme*
• super mushroom - plays power-up sound effect

*The starman and fire bar play music without any player input.

In the US, Toys "R" Us stores gave away six of the Mario items from July 23, 2006 to August 1, 2006 using special Nintendo DS kiosk machines. These items were received from bottle mail that featured Mario's face in the background as you read the letter.

Wild World also features a Mario-themed wallpaper and carpet, named "mushroom mural" and "block floor" respectively.

The characters people create can decorate themselves with facial hair that represents Mario's mustache, a Mario or Luigi hat, and a shirt that resembles Mario and Luigi's hat.

One of the stationery designs is called "SMB3 paper" and resembles the Super Mario Bros. 3 title screen.

One rock per day yields bags of bells when struck with your shovel. For a short time, each whack with your shovel will knock out a bag. After four bags come out, the classic Mario 1-Up tune will play for each subsequent bag that you knock out.