To crash castle its so laggy very laggy that the castle force close:
Step1 pick a background and go to the paint editor
Step2 select the yellow colour
Step3 fork the background
Step4 change the secomd background colour to white
Step5 go to the logic
Step6 pick the trigger "when this created"
Step7 pick the respone that use to create actor
Step8 tap the "create" block in the "create actor from blueprint" edit response menu will appear
Step9 choose the "Repeat N every seconds" and change the vaule to 0.0167
Step10 copy the logic
Step11 paste it on the first background
Step12 set background 2 in the create actor response on the first background
Step13 set background 1 in the create actor response on the second background
Step14 You should not have test it because it will force close so save the deck before testing
Step15 you should add a trigger actor to add the crash background you just need create either
Step16 don't forget to remind all the players in any way
Bonus: i got thess from