You need to be exact in this room, but thankfully there's no need for blind experimentation.
This room is all about understanding how move order impacts the timings. If you understand that all you need to do is count spaces. If you click on the snakes you'll see that they are ordered left to right, so snakes to the left move earlier in sequence.
Take a look at the rightmost intersection. To get the maximum amount of delay for the adder, you want to have a rattlesnake get to the intersection
just before it does. Since the rattlesnake moves first, you'll want to have them both be the same distance away from the intersection at all times (so that they will both on squares adjacent to it.) So try to release the rightmost rattler so that it hits that intersection on the same turn as the adder.
Each of the other intersections follows the same principle. Due to move order, you won't be able to insert rattlers in the middle of the chain of snakes, so you'll always want to have the vertically moving rattler jump right in front of the chain. Again, due to move order, you'll want it to get to the intersection on the same turn that the horizontally moving chain of snakes does since each snake to the left moves before the chain of snakes coming from the right. If you count out tiles you should be able to time this without any need to experiment randomly.
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