These blocks will teleport Mario to a specified secondary entrance, independent of any screen exits within the level. Exits are defined in a table within the block itself, so only one copy of each block needs to be inserted.
There are two variants included: a regular block and a door block. Additionally, a patch which stores the current level number to $010B, which is necessary for these blocks to function, is included in case the user hasn't inserted any other patches with that functionality.
This version contains a bugfix that enables functionality for large warp tables.