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Cave Story does not have built-in cheats, but you can modify the save file to your advantage.
A profile appears to start with "Do041220", so this guide also applies to Cave Story+, where there are multiple save slots. Just add the offset that the profile starts at to the data value offsets.
Profile.dat
All values (unless explicitly stated) are 32-bit unsigned ints, little-endian. To be clear, "1C" refers to the 32-bit int starting at 1C, ranging to 1F.
Open Profile.dat with a hex editor to manipulate the following values:
| Offset | Description |
|---|---|
| 0x1C | Maximum Health |
| 0x20 | Current Health |
| Weapons | |
| There are 6 weapon slots, add 0x14 * (weapon number) to the following offsets to modify the other weapon slots. (These are the offsets for the first weapon) | |
| 0x38 | Weapon Type (see "Weapon Types") |
| 0x3C | Weapon Level |
| 0x40 | Weapon EXP Level |
| 0x44 | Max Ammo |
| 0x48 | Current Ammo |
| Inventory | |
| There are 24 inventory slots, add 0x4 * (inventory slot number) to the following offset to modify the other inventory item slots. | |
| 0xD8 | Item Type (see "Inventory Item Types") |
Weapon Types
| ID | Description |
|---|---|
| 0 | None |
| 1 | Snake |
| 2 | Polar Star |
| 3 | Fireball |
| 4 | Machine Gun |
| 5 | Missile Launcher |
| 6 | Missiles [Bad] |
| 7 | Bubbler |
| 8 | ??? [Bad] |
| 9 | Blade |
| 10 | Super Missile |
| 11 | Super Missiles [Bad] |
| 12 | Nemesis |
| 13 | Spur |
| 14 | "Hajime" [Bad] |
Inventory Item Types
| ID | Description |
|---|---|
| 0 | None |
| 1 | Arthur's Key |
| 2 | Map System |
| 3 | Santa's Key |
| 4 | Silver Locket |
| 5 | Beast Fang |
| 6 | Life Capsule |
| 7 | ID Card |
| 8 | Jellyfish Juice |
| 9 | Rusted Key |
| 10 | Gum Key |
| 11 | Gum Base |
| 12 | Charcoal |
| 13 | Bomb |
| 14 | Dog |
| 15 | Life Pot |
| 16 | Cure-All |
| 17 | Clinic Key |
| 18 | Booster v0.8 |
| 19 | Arms Barrier |
| 20 | Turbocharge |
| 21 | Air Tank |
| 22 | 290 Counter |
| 23 | Booster v2.0 |
| 24 | Mimiga Mask |
| 25 | Teleporter Room Key |
| 26 | Sue's Letter |
| 27 | Controller |
| 28 | Broken Sprinkler |
| 29 | Sprinkler |
| 30 | Tow Rope |
| 31 | Medal of the Red Ogre |
| 32 | Mister Little |
| 33 | Mushroom Badge |
| 34 | Ma Pignon |
| 35 | Curly's Panties |
| 36 | Alien Medal |
| 37 | Chako's Rouge |
| 38 | Whimsical Star |
| 39 | Iron Bond |
There are save file utilities that can change these values for you, and are available from the most common fan sites.