1987 - Super Mario Bros, NES
1992 - Super Mario World, SNES
1997 - Mario 64, N64
2002 - Super Mario Sunshine, GameCube
2007 - Super Mario Galaxy, Wii
From the 2D limited colour palette of Super Mario Bros, the improved visuals and effects in Super Mario World, Mario 64 introducing 3D worlds and analogue control, Super Mario Sunshine with an improved 3D world and the motion controls and shiny visuals of Super Mario Galaxy, each Mario game makes vast improvements over the previous.
These improvements are possible due to the printed circuit boards and CPU power that is inside each console, the control method used to control the game and the imagination of the game designers
No wonder most of these games are constantly featured in lists of the best video games ever.