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they take some thought to beat, but they don't even compare to You have Greater Zombie and Siren, for example, meant for parties of levels 5 and 3 respectively But the ones that are vary wildly in difficulty. For one thing, Tomb of Horrors is not a hack 'n slash, it's more of an experience dungeon, so there aren't that many creatures to fight. However, if you look at the challenge ratings and XP offered by monsters in ToH, you see it's all a bit strange. The 6th dungeon in Yawning Portal is Against the Giants, which recommends characters start at level 11 and gain a level after each of its three chapters, meaning characters in your campaign would be level 14 when they reach Tomb of Horrors. (I actually had a DM start us there in the original ToH at level 3, citing that since it was a "thinking person's dungeon" if we were smart we could get through it).
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You might also caveat before you begin play that there is a very real chance of dying and/or losing everything they have with little to no chance of getting resurrected or recouping their losses in some cases. You could get away with 10th if your players are very logical and detail oriented, but I personally would not submit characters of less than 12th level to this meat grinder unless I had reason to believe my players could think their way though it.
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I own all the originals so I can see where things have changed and have played every edition so the estimate should be pretty close. This would be an estimate on my experience with how converting some of the older modules and the XP earned in them has worked for me in the past and by what they have done to the modules from previous editions. What this all means is that with the starting of 10th recommended by the original and "IF" you combine them to a super campaign you would start ToH right after AtG, which would estimate about 14th or 15th. P5 of the book also indicates that it is possible to run these as a "super campaign" even though they were never written to do so and would require some leg work on the part of the DM to connect them in some logical way. Against the Giants was 8-12 and it is now recommended to start it at 11th. The original White Plume Mountain was 5-8 and it is now recommended to start it at 8th. The module itself does not state explicitly (that I have found) what level ToH was meant for, however, we can estimate based on a few factors to come up with a reasonable guess.