Did the XP Exploit get patched? I free the prisoner, I wait until 100XP are added, I use Dusk till Dawn and the cage is empty.

I bought the game over uPlay.

For the lategame it is useless anyway but for early XP it is necessary. Siwa leveling costs 11minutes for a handful of XP. There is no problem killing the first Boss in lv2 with the Mace counter attack. The leveling before Alexandria isnt great either.

The children hide and seek for 900 is ok, the rest in that place rather not.

Thus I am interested how exactly the exploit works. Is there a possibility that I did something wrong or is it no longer possible?

It's been patched.