Doorlemma

Trimming a bit off the bottom to enable it to open and close (a useful function for doors, though this is only one of two into the games room).  

It's a non-trivial process (like everything here). First off, that door is about 50% bigger than most, and 300% heavier.  Then, the thickness is more than my circular saw will cut.  The jigsaw has the depth, but not the straightness (nor the oomph to cut whatever Armageddon-tolerant wood this is made off).

Answer - use both.  

And the multitool.