Retina MacBook Pro running very hot?

I have a late-2013 Retina MacBook Pro, and it gets really hot really easily. I've monitored the temp with htop and iStat and they both show the same readings. It's supposed to be able to play some pretty graphics intensive games, at least that's the impression I got. I tried playing Rust (very basic graphics for those unaware of the game) on medium settings, and my cpu temp was hovering around 100. I also tried playing Endless Legend, and my cpu temps were hovering around 100 before I even got into the game, just looking at the menu, in windowed mode, at 1280x800 resolution, with low graphics settings, with no other applications running. Is this normal? Is the game performance of the Retina MBP this bad usually or is mine unusually bad? Are these temperatures safe or will they decrease the life of my computer if sustained for a few hours at a time?

EDIT : Check out the performance trying to play a game of chess here. You can see the CPU temp spike to over 100 degrees in seconds

100C (212F) is the thermal limit for the intel processor in your machine. The computer will shut itself down to prevent damage if necessary. This means a sustained and significant increase above that threshold. Not a spike. The temperatures you report are within normal operating temperatures based on the usage. Tips, moving forward:

• Keep your Firmware up to date.
• Make sure the back vents are not covered or obstructed in any way. This ensures proper ventilation.
• Don’t manually adjust the fan settings, or the like, using applications like “iStat Menus." The firmware in your machine is very good (better than you, or I, or any human being) at keeping the machine cool and dissipating the heat produced from CPU/GPU intensive processes.

Bottom Line: This is completely normal behavior and nothing to worry about.

This recently happened to me, and I found the answer (It was in Apple's forums somewhere, I am searching for it and I will source it once I find it).

1. Check your Activity Monitor, it is located in ~/Applications/Utilities/.
2. Under CPU, click the "% CPU" button and make sure the arrow next to it is pointing down.

If Safari is using most of your CPU, here is what you can do:

1. Open Safari
2. Go to Safari Preferences (⌘+,)
3. Make sure both "New windows open with" and "New tabs open with" are not set to "Top Sites"

If you want to view your Top Sites after this

1. Secondary click Safari's NavBar (where the Searchbar/URLbar is)
2. Click "Customize Toolbar..."
3. Drag "Top Sites" icon to where you want.