Save one housemate.

Open all four locked doors in the house.

Listen to voicemails from all six housemates.

Read all letters in the house.

Watch all possible death scenes across all the possible time lines.

Save all six housemates.

Discover the secret personal issues of all the housemates.

Witness every possible event across all the different time lines.

Receive a final revelation.

Save all six housemates while also resolving their personal issues.