World 6-10

World 6-10 is the tenth main level and the twelfth level overall of Ice Land in Super Mario Bros. 3.

Layout
The entire level is made out of ice. After the second pipe is a row of Brick Blocks with Koopa Troopas on them and a ? Block with a power-up. And the end of this row of blocks are a group of Brick Blocks and Ice Blocks, with the right group being a tall pillar and a Buster Beetle behind it. In the group of four blocks to the left of the pillar is a Brick Block containing a Beanstalk to a Switch Block above, which will turn the pillar of blocks into a pillar of coins. After the pillar are some ? Blocks with one containing another power-up, and the area introduces Munchers and Frozen Coins. Next is a Para-Goomba and some more Frozen Coins and Munchers. To enter the Warp Pipe under the Munchers, the player needs to race over to this area after pressing the Switch Block from earlier and defrost the Frozen Coins: If done fast enough, the player will enter a secret area containing a Hammer Suit. After a gap with a Koopa Paratroopa is a row of Frozen Coins and Munchers, with Buster Beetles and Ice Blocks on top of them. After gaps with a Rotary Lift and a Koopa Troopa is the goal.

A sort-of glitch exists in the bonus room with the Hammer Suit: if Mario picks the suit up while sliding down a slope, he will still be sliding with the Hammer Suit on, an action that Hammer Mario can't normally perform. Doing this action reveals an otherwise unused sprite of Hammer Mario sliding, hinting that at one point in the game's development, Hammer Mario was possibly able to slide normally. In remakes, where Luigi has a separate sprite from Mario, Hammer Luigi was also given a sliding sprite, presumably to prevent a game crash.

Also, in the original NES version, atypical values are assigned to the usual "green" palette, causing them to appear white instead. Affected objects include Fire Flower stems, the flashing of Ice Blocks, and the center ball on the Rotary Lift. This trait is also present in World 6-3.

Enemies

 * 5 Koopa Troopas
 * 6 Buster Beetles
 * 24 Munchers
 * 1 Para-Goomba
 * 1 Koopa Paratroopa

Level statistics

 * Power-ups: 3 (2 Super Mushrooms or Fire Flowers and 1 Hammer Suit)
 * 1-Up Mushrooms: 0
 * Secret areas: 1