I know these have been patched. Glitchs to me are fun to do, but they shouldn't be used all the time. Glitchs to me are gaps in the maps, and those gaps let you get outside, or under the map, thats my defination :P
I beat this whole game on Normal and Medium. My technique is to every game, make 2 miners at the beginning and keep getting Speartons and pwn, I maxed mine out and I pwned the last level with 10 Speartons(medium) and 3 with Normal :D
Maybe to you, but he had a tough life :| and its true