Unable to get into the chest with another character

I already beat Binding of Isaac quite a lot of times and am trying to max out Samson. Unfortunately, after beating satan five times with that character I still get endgame video instead of entry to the chest. What character-specific requirements are there for the chest?

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How to go into the chest in binding of Isaac?

How to unlock the The Chest achievement. To get to the chest you must beat Isaac in the Cathedral 5 times unlocking the Polaroid. After you kill mom she will drop the polaroid, and you must then get to the Cathedral, beat Isaac and go to the chest, which will take you to the chest.

How to unlock Dark room and chest Isaac?

Dark Room: Killing Satan in Sheol 6 times will cause The Negative passive item to be unlocked. This item will always drop after the Mom fight once unlocked. To access The Dark Room, you need to beat Satan and touch the chest while The Negative is equipped.

How many times do you have to beat Isaac?

In total, you'll need to defeat him 6 times to go to The Chest.

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