CMSBox

Drag away the panel above the 6 red buttons to get 14th key (push red button to open panel above it)
Drag away brown/red square from right curtain to reveal red button, push it to get 15th key
Push Summon Bugs and take 16th key from between the ears of bunny
Hit tab key and get 17th key from belt of Darth Vader
Drag down the sign at left edge of window (you see only a line first) for 18th key

Drag away second panel on the bottom left of sofa, push red button twice, push last white button on top of sofa and take the 8th key (under belt)
Drag away sky in window and get 9th moving key
Pick up left paper on the floor and drag away white part to get 10th key
Pick up right paper on the floor and call the number that is on it. Wait for flying elephant and pick up 11th and 12th key.
Click the six buttons on the wall (start top right and go anti-clockwise) to get 13th key

Take 2 keys from picture on the left
Take 1 key from reeds in the pond
Drag away water lily to get 4th key
Take 5th key from green picture on table (in the hand)
Take 6th key from pink picture on table (bow tie)
Take 7th key from white picture on table (in one of the stars on top)

that was pretty easy