This is a mod that makes you go SUPER fast on ice and hitting obsidian is a one hit. But you still need a diamond pickaxe to get any drops. You also get double obsidian. This is modloader compatible. (Also I know that the easy to mine obsidian is way overused but I'm a noob)

P.S.
The .zip file will be named Mod.zip.

Installation:
1. Open Mod.zip with 7-zip or Winrar.
2. Go to your .minecraft folder. (I assume you know how)
3. Go to your bin folder.
4. Go to your minecraft.jar
5. Open your minecraft.jar with 7-zip or Winrar.
6. Delete META-INF folder
7. Put the .class files from Mod.zip in you minecraft.jar folder.