Definitely some sort of time control. Invisibility would be pointless because you'd instantly go blind; nothing for the light to bounce off in your eyes

Definitely some sort of time control. Invisibility would be pointless because you'd instantly go blind; nothing for the light to bounce off in your eyes
Control time in any possible way - rewinding, pausing, forwarding, etc
The day I get to 200 in Ping Pong II is the day my life is complete.