Sneek is a way to boot and use the Wii by redirecting all Internal read/write Access into a Emulated NAND.
To achieve that, you copy the full NAND of your Wii (or create a new one) into your SD or USB, and the Wii will use your SD or USB copy of your NAND as if it was the Internal Memory of the Console.
The advantage is that you are not limited to 512MB anymore, and you have a lot more (virtually unlimited) spaces to install and store WiiWare, Virtual Console, Save games, etc.
Sneek runs everything on official IOS (no cIOS needed), as if it was the real Wii. You don't use USBloaders or Disc launchers to play games, they are already on an external storage device which act as a real Wii.
Tintin game is working only with an Original game (retail disc) or on Sneek (Emulated disc).
for more information on Sneek, you should search Sneek topic on the forum.