Bertha, the world's largest tunnel boring machine, is digging a tunnel under the city of Seattle, Washington.
Tap your device to help Bertha dig and avoid pipes.
The game is tough, but not impossible. My personal best is 34, however, my daughter holds the record at 47. Kids.
Tap your device to help Bertha dig and avoid pipes.
The game is tough, but not impossible. My personal best is 34, however, my daughter holds the record at 47. Kids.
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