Speed run veterans TheSpeedGamers are undertaking a three-day marathon to capture all 493 Pokémon for charity!

The challenge: 72 hours to capture all four hundred and ninety-three Pokémon. The team is currently playing through DS titles Diamond, Pearl, Heart Gold, Soul Silver plus GBA titles Ruby, Sapphire, Fire Red and Leaf Green in order to do it. The cause - a children's cancer charity based in Chicago.

You may have heard of these guys before - TheSpeedGamers regularly undertake huge gaming marathons for charity, broadcast live on the web. It's certainly not the first time we've reported on them.

Head over to thespeedgamers.com to watch them live and donate to this very good cause.