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The Sinakawak Shrine in The Legend of Zelda: Tears of the Kingdom is located in the North Hyrule Plain.
Head inside the shrine to begin its challenge where you’ll have to construct a floating device ride up each level eventually making it to the altar. For the first level, get the square board and put one of the flame candles in the middle of it. You can then attach the balloon to the top of the candle and hop on quickly to reach the next level.
On the 2nd level, place a candle in the center of the door then attach the balloon to the top of it. The will send the balloon up pushing a button above the door opening the gate. Head through the doorway to reach the next area.
In the next area, glide down to the bottom level and grab the square board. Stick one of the candles to three corners of the board then facing the missing section of wall, head right to find a side area with a giant ball in the center of pillars of fire. Grab the ball and stick it to the center of the board then attach the three balloons to the candles. This will cause the board to rise bringing the ball with it.
Head to the gap in the wall and use the Ascend power reach the above platform. You can then grab the giant ball from the floating device and put it into the big hole. This will open the door revealing a chest containing an Opal.
Make sure to pull off one of the balloons from the platform and drop it down below. Next follow it down and grab the small ball placing just in front of the gap in the wall. Attach a candle to it and a balloon to that causing it rise into the air. It’s okay if the candle falls over while still attached to the ball, as long as the balloon is attached to the flame it will still go up.
Now use Ascend in the missing section of wall to rise to the above platform where you’ll grab the small ball from under the candle and place it in the small hole to unlock the door to the altar. If the balloon gets to high before you are ready, you can use Recall on it to bring it back down. Once you pass through the door and receive the Light of Blessing, the shrine will complete.