Flint, get the snake. It's worth it to have on hand on that holiday weekend when you have a bunch of relatives over for a visit, and the rental store is closed. That's when plumbing always seems to have problems. The manual (un-motorized) versions that are like 16 feet long are not too expensive, and work for most problems.
At first I thought your symptoms pointed to a blocked vent pipe, but the puddle on the floor in the other room points to a blocked drain pipe. Can't hurt to replace the wax seal, but getting rid of the clog should be 9/10ths of the battle.
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