Avoid It! is a type of Challenge in Where's My Water? 2. In this challenge, players must avoid any ducks while also completing the level. The Ducks are crossed out (and have a red "no symbol") as to not collect them, though players can still kill them with unwanted fluids. The level's icon is a no-symbol emblem.
If the player attempts to collect any Duck in those Challenges, the challenge is automatically failed and has to be reset immediately. The Challenges like these can also be failed by not collecting the Ducks but let the required Fluid run out.
It is the second challenge in this game, which makes its debut at Level 3 in the Sewer.
These challenges are heavily similar to Zero-Duck/Gnome It! challenges from Cranky Challenges and Where's My Perry? respectively, where the level selected for the mentioned challenge actually has a design that requires players not to collect any Ducks or Gnomes, yet can still kill them with unwanted fluids.
The no-symbol emblem is also seen in-game.
When a player kills a Duck that needs to be avoided, the level is not failed. Instead, the level is still continued. The Duck that the player killed in the first place cannot be collected, thus making the challenge slightly easier. Such walkthroughs require the player to "kill" a specific Duck in a specific position instead of collecting it.
Notable examples like these include Keep Them Separated (optionally), Two Worlds Collide, Purple Mountains Majesty (optionally), and Part Down The Middle (optionally).