Double agent and essentials
You know the two bonus maps you unlock in the main mode? Well, they're based on maps from Splinter Cell Essentials on PSP (great game!). The levels are slightly different, have better graphics and completely different stories, but nonetheless the simalarities are obvious.
The tanker mission wasn't originally a mission to recue Sarah, but a mission to destroy crates of weapons guarded by Romanian soldiers; and there was also another part to the level after escaping the ship, in which you had to destroy a SAM launcher.
And the bunker mission wasn't in Germany or wherever it is in double agent, but in a jungle. The original was a rescue mission, but Sam got caught and had to escape (like in the tanker mission in the main game). He wasn't drugged, and the original was much longer.
Also, another minor odd thing I noticed: in essentials, to kill a grabbed enemy, you had to strangle them, and to knock them out you kneed them in the back, but in Double agent this is reversed for some reason (might be a glitch).
More tricks, tips and cheats for this game are right here - Tom Clancy's Splinter Cell Double Agent cheats
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