• Animated lessons: watch how antibiotics work, step by step. The cell wall, the ribosome, DNA gyrase, metronidazole, nitrofurantoin, folate synthesis and the cell membrane (daptomycin). • Animated resistance lessons: MRSA, enterococci and VRE, ESBL and AmpC, carbapenemases and CRAB, and cefiderocol. • Each lesson ends with a short quiz, and a quick check lets you skip what you already know. • Every drug class gets a step-by-step walk-through. • The map now follows drug classes, in the same order as Study. • Night Shift: a new daily board with a score to beat. • The Lab: build a Gram stain slide and train your eye at the microscope. • New bugs: Strep B, S. epidermidis and Citrobacter. • Spot a mistake? Tap the flag at the top of a page to report it. • Your progress is now kept more safely on your phone. • Many fixes, clearer texts and a calmer look.