They only trigger when the player goes off past the edge of the level, useful if you want their effects not to happen when the player is 1 block away from the edge of the level.
Both “level constrain” and “Disable screen barrier via RAM” patches are needed for this to work.
Note: With the update of the level constrain version 3.2 and later, and made it RAM-based, make sure you enable the flags of the sides the block uses so that they function correctly.
A great alternative to the Ultimate Screen Teleporter. The usage might be a bit weird since you still have to place the blocks inside the playable area and not outside. In other words: You'd place these blocks in the same way as you'd do with their regular equilivants.
I also have fixed the position checking at the edge of vertical levels where you just have to touch the screen edge instead to really go offscreen.
Finally, I would recommend on creating a routine and use a flag (like the carry flag) to determine whether to run the code or not.
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