The Sonic Physics Guide is how I implemented my first (good) platformer physics.<p><a href="https:&#x2F;&#x2F;info.sonicretro.org&#x2F;Sonic_Physics_Guide" rel="nofollow">https:&#x2F;&#x2F;info.sonicretro.org&#x2F;Sonic_Physics_Guide</a><p>It&#x27;s fairly hack free in the abstract. But reality is often a little different, based on the quirks of your collision detection.