The Ice Climbers summon an enormous iceberg up from the ground that covers almost the entire stage. The iceberg makes all platforms (including the iceberg itself) slippery for all characters except the Ice Climbers who summoned it.
It can damage and freeze any opponents who touch it or any platforms close to the iceberg. When opponents touch the mound of ice, they get stuck for a few moments and take steady amounts of damage, about 2%. When the opponent freezes on the sides of the mountain, he/she gets a deal of knockback depending on how much damage is accumulated and which part of the mountain the opponent froze at. Any damage can be avoided by edge-hanging through the duration of the move. The iceberg will become smaller if it is attacked by opponents. The size of the iceberg is proportionate to the size of the stage; the larger the stage, the larger the iceberg. Even if the Climbers are separated or one has been KO'd, the remaining climber can still perform the Final Smash, but instead of high-fiving each other, the lone climber lifts up his/her hammer.
Iceberg has received multiple changes in Super Smash Bros. Ultimate. The iceberg now spins around, with a Polar Bear teetering on it. As such, it is no longer possible to stand on the tip of the iceberg or walk up it while it is rising. While it no longer lasts as long, it can also be moved left and right, though doing so will also move the Ice Climbers.
A Condor now circles the iceberg, allowing the Ice Climbers to grab onto it during the move's duration, which will prevent possible self-destructs when controlling the iceberg as well as to make it easier to travel to the other side of it. Anyone else who touches the Condor will take damage. The iceberg no longer has weak multi-hit hitboxes, although it still retains its launching hitboxes. The knockback has been noticeably increased, and both the damage and knockback is even higher if an opponent comes into contact with the Polar Bear. Finally, the iceberg no longer freezes opponents, and lacks the ability to damage players on nearby platforms.
The Ice Climbers' Final Smash. This giant ice mountain appears in the middle of a stage--it's incredibly slippery, so it's hard to control yourself when traversing it. In addition to being slick, this ice is also COLD, so opponents will take damage just from touching it. Attack the ice, and it will take damage and slowly shrink. Is it actually useful? That's a mystery.
The Iceberg glitch is a glitch that involves using Iceberg to push the Ice Climbers and opponents through solid platforms. This can save players from being KO'd.
Using Iceberg near the bottom of the stage on the right side of the "spike" that protrudes from the bottom platform will cause the Ice Climbers to become stuck, thereby floating. If the camera zooms in on the Ice Climbers, it is possible to see that the Ice Climbers are in their falling animation but not falling. If the Ice Climbers try to use any aerial attacks, they will "bounce" off the stage and go into their knockback animation (spinning around with a look of pain). If one repeatedly uses their fair, it is possible for the Ice Climbers to get out to the right side of the iceberg. If one uses Belay at the correct time of leaving the iceberg, Nana will get KO'd, but Popo will perform a super-jump, going over the top boundary line and falling for a long time. Also, when in the iceberg, if the Ice Climbers go into helpless, they will continue to "float" until the Iceberg goes down, dragging the Ice Climbers below the lower blast line, eventually KO'ing them.