Notification chime error low tone, descending
Large and smooth synth tone modulating in pitch and time, phasing in and out, very musical
Digital synth full frequency,ascending then descending, musical
Large and smooth synth tone modulating in pitch and time, phasing in and out
Sound design alert: error sound
Low pitched "ERROR ERROR" as if pronounced by a robot.
Sound design alert: wrong answer alert
A beep indicating an error on a checkout till.
Glitchy distorted impact.