The Nuzlocke Challenge (Pokemon)

-> http://bulbapedia.bulbagarden.net/wiki/Nuzlocke_Challenge

In short : you play whatever pokemon games you want, with these rules (I selected the most awesome ones) :

1. You can only catch the first Pokemon you catch in an area (if you don't already have it)
   
2. If a pokemon faints, you have to release him
   
3. If all of your pokemon faint.. You have lost your Hardcore Pokemon Run
   
4. For extra challenge, banning the use of Pokémon Centers, relying only on Potions and healing items for healing.
   
5. Use the same pokemon as the opponent
   
6. Going to options and making the battle style "set", leaving the player unable to switch out.
   
7. Starter Pokémon is based off the player's Trainer ID number. If the last number is 1-3 the player starts with a Grass type, 4-6 is Fire type, 7-9 is Water type, 0 is the player's choice.

I love these kind of extra rules in games.. Feel more challenging