LIFE 75 lets you pore over hundreds of the best photos ever to appear in LIFE, while the portrait mode serves up over 135 of LIFE’s most intriguing and memorable covers. Along the way, editors and photographers (past and present) offer unique insight on their adventures at LIFE, and there’s even a game that lets you test your eye as a LIFE photo editor. This astonishing collection covers 75 years and may take a few minutes to download, but you’ll be rewarded with the very best of LIFE. Seventy-five years ago, TIME publisher Henry Luce launched a new weekly magazine that he called “the biggest picture show on earth.” The…