-70 missions
-Approximatively 10 hours to finish all the missions, and obviously more to obtain all the medals, hidden items, and other bonuses.
-No other playable characters. Only Sonic.
-They shifted from an extremely active gameplay scheme to an oversimplified one because they found the original too tiring.
-Also according to him, deep gameplays and big adventures don’t suit the Wii philosophy.
-Over 30 mini-games, playable up to four players.
-Possibility to have online downloadable content.
Source
-Approximatively 10 hours to finish all the missions, and obviously more to obtain all the medals, hidden items, and other bonuses.
-No other playable characters. Only Sonic.
-They shifted from an extremely active gameplay scheme to an oversimplified one because they found the original too tiring.
-Also according to him, deep gameplays and big adventures don’t suit the Wii philosophy.
-Over 30 mini-games, playable up to four players.
-Possibility to have online downloadable content.
Source