面临困难

面 = 丆 + 囬 : Mnemonic symbol: a spray flask with one of these liquids which make a surface super slippery.

In the anthill's bathroom (an4), Marilyn Monroe (mi) wants to set up a wind wheel (丆) on top of a closet (囬). Just as she tries to fix it she slips and falls down, the wind wheel crashing on the floor. She didn't notice that somebody used a can of non-stick coating (面) on the closet's surfaces (面).

临 = 刂 + 大 + 囗 + 丨 : In the encampment's kitchen ((e)n2), the robot (大) oversees (临) his army by standing on a huge wooden box (囗). The box is only able to carry his weight because it has been reinforced using a dinosaur bone (丨) acting as a pillar. Just as the robot is about to (临) wave his kitchen knife (刂) into the direction his troops should charge, Li Qingzhao (li) shows up and kicks away the dinosaur bone, causing the robot to fall off his box.

困 = 囗 + 木 : New mnemonic symbol to avoid confusion with 夗: sleeping pills.

Karl Koala (ku) prepared a nest made out of Christmas trees (木) stuffed into a plastic enclosure (囗) in the encampment's bathroom ((e)n4). To make sure that he sleeps (困) really well he pops sleeping pills (困) before laying down in his nest.

难 = 又 + 隹 : Mnemonic symbol: a video game which is almost impossible to beat.

难 = 又 + 隹 : Just inside the anthill's kitchen, Napoleon and a sparrow are trying to beat an insanely difficult video game. After playing and failing all day long Napoleon finally loses his temper and crashes the game wearing two boxing gloves.