SMZ3 has added keycards to SMZ3 to gate things outside of normal game logic. Below is a list of the keycard door locations. Plan your route accordingly. This information is pulled directly from the source code:
Keysanity Keycard Door Locations
| Area | Keycard | Door Location |
|---|---|---|
| Crateria | one | Landing Site - Door to gauntlet |
| Crateria | one | Landing Site - Door to landing site PB |
| Crateria | two | Before Moat - Door to moat |
| Crateria | boss | Before Tourian - Door to Tourian |
| Crateria | boss | Before Bomb Torizo - Door to Bomb Torizo |
| Brinstar | one | Blue Brinstar - Door to ceiling e-tank room |
| Brinstar | two | Green Brinstar - Door to etecoon area |
| Brinstar | two | Pink Brinstar - Door to wave gate e-tank |
| Brinstar | two | Pink Brinstar - Door to spore spawn super |
| Brinstar | boss | Pink Brinstar - Door to spore spawn |
| Brinstar | boss | Before Kraid - Door to Kraid |
| Wrecked Ship | one | Outside Wrecked Ship West - Door to Reserve Tank Check |
| Wrecked Ship | one | Outside Wrecked Ship West - Door to Bowling Alley |
| Wrecked Ship | one | Gravity Suit - Door to Bowling Alley |
| Wrecked Ship | boss | Pre-Phantoon - Door to Phantoon |
| Maridia | one | Mt Everest - Door to Pink Maridia |
| Maridia | one | Aquaduct - Door Towards Beach |
| Maridia | two | Pre-Botwoon - Door to Botwoon |
| Maridia | two | Pre-Colloseum - Door to Colloseum |
| Maridia | boss | Precious Room - Door to Draygon |
| Maridia | boss | Cactus Alley Door changed to a Boss Door (reasons) |
| Upper Norfair | one | Business Centre - Door Towards Ice |
| Upper Norfair | one | Pre-Crocomire - Door Towards Ice |
| Upper Norfair | two | Lava Missile Room - Door Towards Bubble Mountain |
| Upper Norfair | two | After frog speedway - Door to Bubble Mountain |
| Upper Norfair | two | Below Bubble Mountain - Door to Bubble Mountain |
| Upper Norfair | two | Lower Norfair Escape - Door to Bubble Mountain |
| Upper Norfair | boss | Pre-Crocomire - Door to Crocomire |
| Lower Norfair | one | Worst Room In The Game (WRITG) - Door to Amphitheatre |
| Lower Norfair | one | Exit - Door to "Reverse Lower Norfair Entry" |
| Lower Norfair | boss | Pre-Ridley - Door to Ridley |