I just did some googling around the internetgambling subject and came to the conclusion the BLOG (officialy known as TOS, or is it the other way around) is based on multinational laws, something that explains why Linden Lab employees go one step above the BLOG, BLOG clearly states that skill games are ok, but they're not...
Sudoku = banned
Because, The UK Gambling Act of 2005 (wich will come be taken to effect the coming september) concludes the following: "Even a game where there is an element of chance that could be overcome by superlative skill will be considered gambling." source: http://www.virtualworldsnews.com/2007/07/follow-up-on-uk.html
Btw. if anyone that was running sl gambling biz, or is running sl escorting biz and is even close to the idea of moving to Hipihi, just forget about it... Hipihi will be sl just with even more restrictions: gambling = not ok, sex = not ok, virtual violence = not ok, political opinions = not ok, and so much more that is also not ok!