Armor Sandbox is a 2D impact physics playground. Pick something to shoot, pick something to shoot at, and watch what actually happens. Nothing here is a canned animation. Every plate, every projectile and every fragment is made of particles that carry real material properties: density, strength, melting point, heat capacity. Deformation, fracture, spalling, heat, fire and detonation all follow from those numbers. Swap the steel for glass and it shatters instead of denting, because glass is brittle, not because somebody drew a shatter effect. WHAT IS IN IT • More than 110 materials: steels, aluminium alloys, tungsten, tantalum, ceramics and glass, concrete and stone, wood, rubber, water, fuel, explosives and working electrical parts • More than 60 projectiles, from pistol rounds to APFSDS long rods, shaped charges and hypervelocity rods • More than 90 targets: plates, layered armour packages, deep blocks, circuits • More than 35 vehicles in cutaway: T-34-85, Tiger I, Panther, Sherman, IS-2, T-55, M103, T-72 with and without reactive armour, M1A2 Abrams, Leopard 2A6, Challenger 2, BMP-1 and M113, plus cars, trucks, a school bus, a farm tractor and aircraft, each with its armour, ammunition, fuel and engine where they really sit • More than 60 ready-made experiments to start from MAKE YOUR OWN Paint projectiles and targets cell by cell, choosing the material of every cell. Mirror, outline, replace, snap to a grid. Save them to your library, and send a design to a friend as a single small file. WIRE IT UP Batteries, capacitors, switches, sensors and delay lines. Current only goes where you drew a path: an insulated wire running along steel leaves the steel dead, bare copper makes the whole plate live. Lamps, heaters, electromagnets and high-voltage sparks that jump the air. SEE WHAT THE EYE CAN'T Watch the same impact in four views: normal, heat, speed and damage. Time slows down by itself around the impact, and you can pause, step through it frame by frame and fire again. NO ACCOUNT, NO ADS, NO TRACKING The app makes no network requests of its own. Nothing you build leaves your iPhone unless you share it yourself. FREE TO WATCH, ONE PURCHASE TO CREATE Watching is free. Every built-in experiment runs in full, explosives, nuclear devices and circuits included, and so does every vehicle and every material a preset uses. Opening a design someone sent you is free too. The full version is for making things: painting with energetic, nuclear and electrical materials, a library without the five-per-kind limit, exporting your designs, and the Extreme and Maximum quality levels. One payment, no subscription, no ads either way. Armor Sandbox is a physics simulation made for curiosity. Everything happens to particles in a 2D cross-section, and nothing in it is a guide to building anything real.