Heart Box is a wickedly clever physics puzzle where a tiny robot with a fading battery steals the spotlight. Professor Rat built Robby, then saddled him with a power cell that drains faster than you can blink, so the little guy must survive a gauntlet of wacky experiment rooms. Your goal is simple: break Robby free from the charger and guide him to safety; you'll interact with fans, lasers, magnets, portals, ropes every weird contraption in the lab. There's over 180 levels that prod your brain in all the right places, plus four game modes to shake up the formula. The physics are crunchy and believable, the visuals pop with bright cartoon charm, and the animations give every gadget attitude. Runs right in your browser, quick to pick up, hard to put down. A full Level Editor lets you build intricate puzzles, share them via QR codes, and explore an online database packed with 10,000+ community creations. You can swap skins to freshen Robby's look, while global leaderboards track every slick solution and nail-biting save as you and your friends trade records. Short bursts of pure "aha". Long chains of delightful dominoes. One tiny robot, endless experiments. Jump in and power up Robby!