Complete all available challenges and reach level 50. You can now use the "Regeneration" option to start again at level 1, but gain experience points and be marked with a special chip next to your username. The increase in experience points for each generation is as follows.

Generation 1: 100%
Generation 2: 110%
Generation 3: 120%
Generation 4: 130%
Generation 5: 150%
Generation 6: 180%
Generation 7: 210%
Generation 8: 250%
Generation 9: 290%
Generation 10: 350%