En el apartado Why and how pone lo siguiente:
15-20% of gamers are disabled (PopCap). Other conditions that aren’t registered disabilities can also hit barriers. 15% of the adult population have a reading age of below 11 years old (NCES /BIS), 8% of males have red-green colour deficiency (AAO), and many people have temporary impairments such as a broken arm. Many more have situational impairments such as playing in a noisy room or in bright sunlight, and all players have different levels of ability – there’s no ‘typical gamer’.