htc onex+ overheating playing games- normal?

[Mitchturbo]

Sup so just got my hox+ yesterday and was playing some games like dead space and noticed the phone getting very hot. Carried on playing and eventually my hand had melted to the handset Lolol. Exaggerating but you will hopefully know what I mean.
Is this normal for a quad core phone?

 

[Driftfog]

I received my One + yesterday and found it does heat up quite a lot but I read a couple of reviews over the last month or so and they all mention the One + getting quite hot, it could be the rubberised coating on the back holding the heat according to one review which would make sense.
I would think it wouldnt be an issue as 3 people I know say the same and the phone would have been bench tested by the manufacturer and the reviewers to the limit and as said its mentioned in a few reviews.

Its a good point though, how do processors in tablets and phones get to cool down without a cooling fan? Or am I just old school