The House of the Dead

"As a special operative, your mission is to rescue the DBR laboratory staff, while fending off hordes of un-dead and other genetic mutations. Load your weapon and splatter every rotting zombie, beefed-up cadaver and killer monkey that stumbles your way!"

This is the original 1996 release for Sega Model 2 arcade machines, it was later ported to PC and Sega Saturn while downgrading all graphics to fit their respective technical boundaries. The game features branched paths in all stages except for the final one, so I included them either on the second playthrough with G or at the end of this video, in order to keep the stuff neat, along with the bad ending in 2 players mode. To get the good ending you have to score at least 60,000 points, and for the secret room you need to save all 16 civilians, this requires following a specific path though. All of that are also in this longplay as well.

0:00:00 - Start/Attract mode
0:02:30 - 1st chapter: Tragedy (Path 1)
0:06:58 - Boss: Chariot
0:08:16 - 2nd chapter: Revenge (Path 1)
0:13:02 - Boss: Hangedman
0:15:41 - 3rd chapter: Truth
0:21:13 - Boss: Hermit
0:22:56 - Final chapter: The House of the Dead (w/ secret room)
0:26:25 - Final boss: Magician
0:30:04 - Rogan's ending (solo), credits & post-ending (Sophie lives)
0:32:42 - Second playthrough with G (Path 2)
1:01:18 - G's ending (solo)
1:03:48 - 1st chapter: Tragedy (Path 3)
1:09:06 - 1st chapter: Tragedy (Path 4)
1:15:22 - 2nd chapter: Revenge (Path 3)
1:21:47 - 2 players ending & post-ending (Zombified Sophie)