I know exactly what you are talking about! I had the same problem for like ever! Here's
the thing, go to the part where you hit the white tombstones and the coffins open up.
(gloom and doom down in the tomb. Part 2 i think? ) trust me, hit the stones, check up
there, leave to the gloom part 3, then come back and repeat. Try this multiple times
because the last twenty will come out the end two coffins closest to the gloom part 1.
Trust me, it should work. Tell me if it works.