Cheating in VirtualBox

Discuss about Blockout II from Jean-Luc, post your feature requests etc.

Cheating in VirtualBox

Postby scblockout » Sat Oct 25, 2014 7:52 pm

Some time ago I found a way to create fake scores using Virtual Box. I thought that it would be interesting to post that here.
This is the setup:
- Windows XP virtual machine
- Blockout II version 2.4
- Virtual Box guest clock slow down to 50%, with the following command (see Vbox manual section "Accelerate or slow down the guest clock"):
Code: Select all
VBoxManage setextradata "VM name" "VBoxInternal/TM/WarpDrivePercentage" 50

(should execute command when VM is off, it does nothing if it's already running)

See for example this fake score, I managed to "play" at 99 BPM in 3D Mania level 9:

Is it actually possible to detect this kind of fake? What about a more subtle clock tuning?
Posts: 34
Joined: Sat Feb 02, 2008 2:59 pm

Re: Cheating in VirtualBox

Postby jlp_38 » Mon Oct 27, 2014 3:09 pm


Theoretically, if you run the game in a virtual environment that perfectly decreases the machine timing, it won't be possible to detect cheating. The only solution would be to do an online check while playing.
The score you registered has a good timing check but not perfect, so it is possible to detect it. However, without cheating, you might have a small error on the timing check due to unexpected CPU overload (for instance) while playing.
I'll try to improve this on the next release.
Posts: 264
Joined: Tue Jun 26, 2007 9:09 am

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