Getting the Green Catseye in the church
In Chapter 1-3 in the church, turn right. Go to the small path at the back of the church. You will see a blinking object. Get near it, then press X to check. After that, first rotate seven times using option 3, another five times using option 4, then one more time with option 3. You will hear a sound and can now get the Green Catseye.