Some 6.7m (2.2) watched ABC's two-hour broadcast of the slapstick assault course challenge between 8pm and 10pm.
Rookie Blue followed with 5.7m (1.5), also improving its audience week-on-week.
Elsewhere, Big Brother maintained a solid 6m (2.2) for CBS at 9pm, after which a special preview of 3 garnered 2.4m (0.8).
The Tiffany Network's runner-up primetime position was also thanks to a repeat of The Big Bang Theory, which amused 7.8m (2.2) at 8pm.
Over on Fox, Take Me Out held a steady-if-unspectacular 2.9m (1.2), while Saving Hope (2.9m/0.9) and Rock Centre (3.7m/0.8) both grew for NBC.