Thief Gold

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3. I think the first two games have impeccable pacing (though I've heard that the added levels in Thief: Gold ruin the pacing and I've never played those).

Thief Gold adds three levels early in the game. They are great levels and fun to play through, but it does get quite jarring since they're very large, much larger than the levels they were inserted between. In fact, they are probably the largest levels in the game.

In addition to this there is a large easter egg area added to one of the regular missions. I don't really like it.

The way I understand it is that two of the levels added are just padding essentially. So instead of spreading the talismans over two levels they spread them over four. Personally I don't see a need for it and I found the way it was paced in TDP to be excellent. Just gonna have to play Gold to see I guess.