80% at home, 20% on the go. It also depends on the game I want to play at the moment. Quick accessible games are better suited for playing on the go. Right now, such games would be Rhythm Heaven, Elite Beat Agent or Mario Kart 7.

I only ever play my 3ds at home or at work (roughly 50/50, but I almost class work as the same as playing it at home)...or on planes which I'm only on maybe 3-4 times a year...

I don't have a handheld device right now because my Nintendo DS died a couple of years ago but when i had it, I used to played with the DS nearly all the time.

I played on Vita at launch, and would probably do again if a big game came out

However, in general, I only play phone games on the toilet

Never. I haven't played a handheld game (at any length anyway) since the Atari Lynx and don't intend to.

I play 50% on the toilet.. that counts as home right?

Man, if the game is good, I'll play it everywhere. I buy games and consoles to play at work but when I get into it, I can't stop. I was playing Final Fantasy Tactics while laying in bed with my GF, I was so hooked! Mario Kart 7, Street Fighter 4 and Resident Evil Rev. Were games that had me hooked with their online modes so they got a lot of home use, too. On a work day, when things are quiet, I'll log in up to eight hours on a portable.

I chose 50%. Thank God for portable gaming!

I rarely take my hand held gaming out of my home. Kinda silly for 30+ years old man like my self playing with a DS/3DS in public.

I play handheld only at home or while traveling (in my car (when I am not driving ;P), in the train...)

Almost 100% of the time. I sometimes bring my Vita out just to look cool. lol