Believe it or not, Connect Four was originally released in February of 1974, which makes it 37 years old. In that time, it's seen some minor updates and variations, but it mostly remains the same game that it was all those years ago with a plastic grid and some colored tokens.
Fast forward a decade or four, and the old classic seems to have been somewhat re-imagined and brought into the 21st century thanks to an Android game called Gravity Wins.
There are two versions of Gravity Wins: a free, ad-supported version, and a paid, ad-free version. The game is identical on both, so as long as you don't mind an ad at the bottom of your screen whilst you're playing, you can save yourself a buck.