Super Mario Bros. turns 25 today -- a huge milestone for the game that many believe saved the videogame industry. See how the series evolved from an 8-bit smash to and cosmic adventure.

If you’ve played Super Mario Bros ... turning it into its blocky, 8-bit design. Mario would then have to navigate a level filled with hungry birds that could eat each block.

When the original Super Mario Bros was released in 1985 ... but there's still something charming about that nostalgic 8-bit design. You'd be forgiven for missing this crafty design detail thanks ...