Skeleton key

Skeleton keys are special rewards in Medal of Honor: Rising Sun that allow players to acquire hidden skin collectables across the game's levels.

Each level has its own skeleton key and it's rewarded after the level is completed with certain gameplay performance criteria. Those performance criteria are completing all bonus objectives available in the level, having a certain amount of hits taken and a certain percentage of accuracy.

Skeleton key requirements for each level
Level	Bonus Objectives	Hits Taken	Accuracy
Day Of Infamy	2	N/A	N/A
Fall of the Philippines	2	0 to 99	100% to 75%
Midnight Raid On Guadalcanal	2	0 to 49	100% to 75%
Pistol Pete Showdown	2	0 to 49	100% to 75%
Singapore Sling	2	0 to 49	100% to 75%
In Search of Yamashita's Gold	2	0 to 49	100% to 85%
A Bridge on the River Kwai	2	0 to 89	100% to 85%
Supercarrier Sabotage	2	0 to 149	100% to 50%

There is no Skeleton key for Pearl Harbor (level)

Once a skeleton key is collected, player can re-play the level, find the location of the skin, and unlock it.