U have to buy a nintendo Ds Lite 2 play the brain teaser games. If u dont want to pay for a DS lite then another good option is to download a brain teaser game 2 ur mobile phone, costs about �5. I got one on my phone and its almost the same as the one u can get on the DS Lite-and easier 2 use as a phone is smaller and more convenieint on the phone as u can use it on the bus etc- I wouldnt take my DS outside of my house. Theres no poiny buying a DS just 4 one game so just get it on ur phone