Please use Google Chrome Web browser!
Please allow pop-ups for this domain
If in network/global multiplayer mode make sure each participant went through step 1) before EVER launching step 2) (which only 1 person should do)
No need to load step 1) when playing alone/local mode (but you could still invite your local people to play with you on your sound system)
Keep all necessary pop-up windows open during session
if on mobile (or other reduced width screen) turn device view from portrait to landscape