From Sega Retro

The Segathon was a fundraising effort sponsored by Sega Europe to assist the BBC Children in Need charity in 1993.

The idea was to sponsor someone to play a Sonic the Hedgehog game for either 15 minutes or until a certain score was reached. Sponsors would state how much they were willing to pay per 10,000 points. Application forms were given away in an issue of Mega, with cheques sent directly to Children in Need (Sega presumably profiting from the venture by people buying Sonic games).

Maximum points allowed

Game System Score
Sonic the Hedgehog Sega Mega Drive 100,000
Sonic the Hedgehog 2 Sega Mega Drive 100,000
Sonic the Hedgehog Spinball Sega Mega Drive 10,000,000
Sonic the Hedgehog Sega Master System 60,000
Sonic the Hedgehog 2 Sega Master System 100,000
Sonic Chaos Sega Master System 90,000
Sonic the Hedgehog Sega Game Gear 100,000
Sonic the Hedgehog 2 Sega Game Gear 90,000
Sonic Chaos Sega Game Gear 70,000
Sonic the Hedgehog CD Sega Mega-CD 100,000