Official Everybody Edits Forums

There are three basic attacks. They are triggered by pressing down, quickly followed by another arrow.
Down+left and down+right are basic attacks, which make arrows appear on the opposite side of the arrow you pressed (i.e. down+left will push somebody to the right of you rightwards, and down+right will do the same for the left).
Down+down is used for blocking. Blocking is useful for interrupting somebody's jump (to make them fall down), but can also be spammed to double-jump (technically, it means you jump on the block before it disappears).
Down+up spawns arrows on both sides of you, pointing inwards. It can be useful to get campers out of corners.
Basic attacks have a 1 second cooldown.

Special attacks work a bit differently. They can be purchased in the shop (the lower part of the hub) for coins. You can store three special attacks at a time: one triggered by pressing up+down, one for up+left or up+right, and one for up+up. You will have to memorize the type of attack, however most attacks work quite intuitively. You cannot keep special attacks between sessions, so use them before you leave (or before the bot is closing)!

There are a few ways to obtain coins. The most straightforward one is to grab coins that spawn on the field: blue coins are worth 1 coin, and golden coins are worth 5. You also get 25 coins for winning, and you can get up to 50 coins from chests!

Chests and other containers appear during the battle. You can open them by pressing a certain arrow twice while standing directly next to or on top of it (or under it, if you manage to get there somehow), depending on where you are (i.e. double down when you're on top of it, double left if you're on the right, etc). There are different types of containers, and some may give you items, while others might give effects!

Every now and then, a Smash Ball appears (the viking shield decoration), floating around the screen. You hit it just like a container, although it will be much harder, because it isn't solid and floats around the map freely! If you manage to hit it, don't get happy yet—you need to hit it once more to destroy it! If you manage to get it then, press down+down (it will replace your blocking move) to use your Final Smash. Keep in mind that every smiley has a different Final Smash!*

The power of your basic attacks (and a few special ones) is determined by your tier. Your tier is determined by your amount of wins. The higher your tier, the better and more effective your basic attacks will be! Of course, it won't be impossible to defeat people in higher tiers, because of the presence of large maps and Final Smashes.

If the round hasn't ended after 2.5 minutes, the screen will fill with lava. The lava will rise by 1 block around every 5 seconds.

!coins: Shows the amount of coins you have.
!wins: Shows how many times you've won.
!tier: Shows your tier, and how many times you still have to win to reach the next one.
!items: Shows the items you have in your inventory.

NOTE: This list isn't done. I still have to make quite some Final Smashes. Ideas are welcome.
Default — Guestbomb: Immediately places 5 smiley blocks on random spots, which burn afterwards and stay for a few seconds. During that time, your attacks will be delayed until it ends!
Devil — Lava Flood: One of the most effective Final Smashes. Floods the lower half of the map with lava. Woot item recommended on low maps.
Santa — Fake Containers: Allows you to place 3 fake containers wherever you are. When opened, they do something awesome.
Bird — Easter Egg Bombardment: Grants the Fly effect, while being able to place 5 eggs which will slowly descend, and burn afterwards.
Bunny — Easter Egg Bombs: Grants the Jump effect, while being able to place 5 eggs which burn afterwards.
Fire Demon — Pyromania: Allows you to place 10 fires, which disappear after a few seconds.

...Hey, what's this?

When you give a woot, you get an item, along with 10 coins! The Woot item is a secret item which could potentially save your life. It is an up+up item, but if that slot is full, you get 50 coins instead of 10. Just to compensate.