Let's make this birthday one to remember.

69 years old (Born on March 14, 1956)

Happy Birthday, Alexey Pajitnov—the brilliant mind who taught us how satisfying and deeply addictive stacking blocks could be! Without you, we might still think fun puzzles involved pieces that get lost under the sofa or chewed up by pets. Instead, you've gifted humanity with countless productive hours (depending on one's definition of "productive") rotating colorful shapes into pixelated masterpieces.

Your creation has stood strong since 1984—proving once again you're an engineering legend whose success stacks up beautifully year after year. May your birthday celebrations fit flawlessly together without awkward gaps—just like a perfectly placed Tetris block!