Removing Non-Load-Bearing Blocks
Removing blocks that bear little to no weight is the first step to prolong a Jenga game. This generally means removing the middle blocks first, which allows the sides to support the weight of the structure, much like a log home. Carefully remove the middle blocks by using one finger to push the blocks through to the other side.
Tapping Blocks
Another effective method is gently tapping a block to see if it bears weight. If it is loose, then you know it is safe to grab. Don't get overconfident when you see a loose block, as it can hit another block upon removal and topple the whole structure.
Placing the Blocks on Top
Removing the blocks is only half the process in Jenga; you also need to place the removed blocks on top. Stack the blocks in the middle first, then move to the outside. After the middle block is placed, try to stack the block opposite of the side of which it was removed, in an attempt to counterbalance the weight. As you place the block down on the top, lower it as closely as possible into position, then drop it down. Placing it down directly may cause accidental pressure that results in destruction.
Properly Removing Side Blocks
As the game progress, you eventually have to remove the dreaded side blocks. In Jenga, it is against the rules to use more than one hand at a time; this means difficulty in removing load-bearing blocks with a steady hand. Instead of taking the block out sideways, slowly push or lightly tap the block forward until it is halfway through. Where the block is protruding out of the structure, place your finger underneath the block, and try to flick or nudge the block farther out until you can grab it.