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I'll level with you all: even with StarCraft's currency and supply-related cheats, I've still never cleared the Protoss campaign. That's a pretty bleak level of ineptitude, but at least using "power overwhelming" to turn mineral-gathering Probes into slow-but-steady death machines makes me feel better about it: "Oh, you've surrounded my drone with Zerglings and acid-spewing Hydralisks? That's cute, prepare to kiss your Hive goodbye ... in about 8 minutes."
In terms of cheating purely for entertainment value, I think Grand Theft Auto 4 was the first in the series where I didn't instinctively use weapons cheats. For years, the GTA series was just about finding calm in the utter havoc I caused, and if an ammo shortage was the only thing in the way of my zen, cheats were an immediate solution.
What about you? Have you had to resort to cheats to persevere through a game's toughest challenges, or is there a particular code that's actually made games more enjoyable for you? Tell us all about your favorites, right after you check this week's Japanese hardware sales!