Bio Clock (バイオクロック), called Bio Clock in broadcast, was an obstacle which originally appeared in VIKING 1's Third Fantasy Stage as the final obstacle, however, due to the difficulty of the previous stage, it wasn't attempted until VIKING 2. In VIKING 3, due to Third Fantasy Stage being deleted altogether, this obstacle would never appeared again.
Competitors were to stand on a trapdoor, while a button stood in front of them. They were to press the button to activate a digital clock that would begin to count upwards, however, entering the seventh second after the clock started, the clock would be hidden, leaving the competitor to time the clock themselves. The competitor then had to press the button again to stop the clock whenever they thought the clock was at ten seconds or as close to ten as possible.
There was a small margin of error given; the competitor was allowed to be 0.50 seconds under or over 10 seconds (so the safety range is 9.50 seconds to 10.50 seconds). If the time was not exactly ten or within the margin of error, the competitor would be dropped into the water via the trapdoor.
In the first two tournaments, competitors could choose to give up the chance of attempting both Bio Clock and Final VIKING, taking home ¥500,000 that they already earned via beating the first obstacle before (either Steady Voyager or Ultimate Plank). If they decide to attempt the obstacle, a failure means the prize will be reduced to ¥100,000 and they won't be able to attempt Final VIKING, however, a success means the prize will be increased to ¥1,000,000 and they will advance to Final VIKING.
Nagano Makoto was the only person to attempt the obstacle, choosing to attempt this after clearing Ultimate Plank in VIKING 2. He cleared after stopping the clock at 9.78 seconds, well within the margin of error, thus being awarded a prize of ¥1,000,000 and entry to Final VIKING.
Competitors' Success Rate
- All results based on the Fuji TV broadcast and external information found.