Just add a string and some peanut butter.

use something light and smooth like dental floss for the string

Clean the track with a knife so the door can easily fall down.

Have tried many traps but have noticed that mice do not like trapdoors or doors that they have to push on, so I designed this one.

UPDATE

I had a motion detector camera and have noticed that sometimes the mouse triggers the trap and the door falls onto the back of the mouse. and it can get out.

Have now updated the files so the trigger plate is shorter and the whole trap a little longer.

Found that some mice can open the hatch from the inside, so updated the trap so a hook locks the hatch when triggered.

If you like my model feel free to boost :)