sprite.play

sprite.play acts on sprite: it plays. It takes id, fps, loop, fromFrame and toFrame. fps, loop, fromFrame and toFrame are optional.

sprite.play(id, fps?, loop?, fromFrame?, toFrame?)

function start() {  const id = sprite.create('/sprites/hero.png', 100, 120);  sprite.play(id);}

sprite.create is there to give the call something to act on; sprite.play is the line that matters. The code sits in start(), which the engine calls once, when the entity spawns.