The world map is back with a SMW look, you can unlock the four hidden switch palace. Yoshi is also present to help Mario to deal with way more types of monsters than the first game.
Mario can carry objects like a koopa shell, a springboard or the pow switch. Mario has also more moves, he can : swim, slide, climb on vines, walk on walls and fly using his magic cape (feather).
SMF2 contain more types of collisions than SMF : ledges, water tiles and different kind of slopes. Now based on Super Mario World, the game includes : vertical scrolling, two layers of tiles, Auto-scrolling levels, Movable layer 2 (screenshot 5) and Water Mode level. Super Mario Flash 2, sequel of Super Mario Flash, is what a sequel should be, the same with more stuff :D. For FireFox, right click where the game should display and choose 'Activate this plugin' and then select 'Allow'. You need to make sure your browser has an 'Adobe Flash plugin' and that it is activated. NOT WORKING: Flash (.swf) games are now not activated with most browsers.