keysanity table

keysanity table of interest
"keys": how many small keys are available to pick up
"go mode": minimum keys needed to go mode the dungeon optimally
"logic": minimum keys the logic expects you to need to complete the dungeon
"clear": minimum keys needed to full clear the dungeon optimally
+ refers to big key
parentheses refer to items that must be possessed to achieve the specified key count (B is bow, H is hammer, S is cane of somaria, HS is hookshot) -- if you don't have these items, you need an additional small key

dungeon  | keys     | go mode  | logic    | clear
EP       | 0        | 0+       | 0+       | 0+
DP       | 1        | 0+       | 1+       | 1+
ToH      | 1        | 0+       | 0+       | 1+
PoD      | 6        | 1+       | 6+       | 5+ (B,H)*
SP       | 1        | 1        | 1        | 1+
SW       | 3        | 0        | 3        | 0+
TT       | 1        | 0+       | 1+       | 1+
IP       | 2        | 0        | 1+ (S)   | 0+ (HS)**
MM       | 3        | 0+       | 0+       | 0+
TR       | 4        | 3+       | 4+       | 4+
GT       | 4        | 0+       | 4+       | 2+

* hammer jump can save another key in PoD
** a bomb jump in the hookshot room can eliminate the need for hookshot in IP

Hyrule Castle and Castle Tower are two different things!
Hyrule Castle: this is the sewers, there's 1 key to find
Castle Tower: this is Agahnim's Tower, you can get a chest with no keys, another chest with 1 key, and reach Agahnim with 2 keys