As you play the game, you will gain score. At the end of the game this score is converting into xp as follow:

• You get 100% as account xp
  
• The character's ability/power get 1/4
  
• The 3 equipped perk each get 1/4

This does not change even if you equip less perk, or if one of the perk or the character's ability gets maxed out.

Non Repeatable Events

Repeatable Events

The amount of xp that you can gain while playing victims is limited since most of the events are non repeatable or there is a limited amount of them in the map such as locked door. Also, remember that stabbing grandpa is worth just as much as escaping so it can be a good idea to find the time to go see grandpa before escaping or before dying.

Repeatable Events

Family is a bit simpler than victims, since all events are technically repeatable. You just need to get your vial to its maximum for that 100 bonus then you need to empty it by feeding grandpa which will also give you xp. Since leveling grandpa grants the xp to every family member, it is a good way to help others who want to level up too. The tricky part is managing to do that without letting the victims escape.