Australian Ninja Warrior 4

Australian Ninja Warrior 4 was the fourth season of Australian Ninja Warrior, which premiered on July 26th, 2020 at Channel 9. For this season, 160 competitors participated over four qualifying heat episodes, two semifinal episodes, and two grand final episodes.

It is worth noting that half of this season's competition was taped before social distancing restriction came into place due to COVID-19 pandemic. This became evident when they introduced "Audience Lock-Out" during the semifinals and in Stage One of the grand final, only allowing family members and close friends of the competitors to attend the taping. Later in the season finale episode, the competition was taped without any audience, and family member and close friend of the competitors.

It was also announced that at the end of the season, a two-part special named Australian Ninja Warrior: State of Origin would be aired, consisting of different teams based on different states of Australia.

The Heats
The Heats were run over in just four episodes, with 40 competitors in each heat. The 16 fastest competitors who completed the course in each heat would advance to the semifinals. If less than 16 competitors completed the course, the competitors who got the furthest and fastest round the course would advance to the semifinals. There was no time limit in the heats.

Similar to the city qualifiers round on American Ninja Warrior 11, the heats on this season also featured the Power Tower. The top two competitors from each heat would compete on this side-by-side obstacle course, with the winning competitor receiving a ten-second time advantage in the semifinals.

Obstacles
① Quintuple Steps

② Tic Toc to Net

③ Bridge of Blades

④ Doorknob Drop

⑤ Double Squirrel

⑥ Warped Wall

Obstacles
① Quintuple Steps

② Tic Toc to Net

③ Bridge of Blades

④ Doorknob Drop

⑤ Flying Shelf Grab

⑥ Warped Wall

Obstacles
① Quintuple Steps

② Butterfly Wall to Zipline

③ Bridge of Blades

④ Bar Hop

⑤ Flying Shelf Grab

⑥ Warped Wall

Obstacles
① Quintuple Steps

② Butterfly Wall to Zipline

③ Bridge of Blades

④ Bar Hop

⑤ Basket Toss

⑥ Warped Wall

The Semifinals
The Semifinals were run over in two episodes, with 32 competitors in each semifinal. The 12 fastest competitors who completed the course in each semifinal would advance to the grand final. If less than 12 competitors completed the course, the competitors who got the furthest and fastest round the course would advance to the grand final. There was no time limit in the semifinals.

Similar to the city finals round on American Ninja Warrior 11, the semifinals on this season also featured the Power Tower. The top two competitors from each semifinal would compete on this side-by-side obstacle course, with the winning competitor receiving a second-chance advantage in the grand final (a very similar to the Safety Pass on American Ninja Warrior 11).

Obstacles
① Snake Run

② Rolling Log

③ Diving Boards

④ Ring Toss

⑤ Sling Shot

⑥ Warped Wall

⑦ Barrel Roll

⑧ Spider Jump

⑨ Invisible Ladder

Obstacles
① Snake Run

② Rolling Log

③ Diving Boards

④ Ring Turn

⑤ Sling Shot

⑥ Warped Wall

⑦ Barrel Roll

⑧ Spider Jump

⑨ Invisible Ladder

The Grand Final
The Grand Final was where the remaining 24 competitors from the semifinals would battle it out to become the first "Australian Ninja Warrior" and the cash prize of AU$400,000 (since no competitor achieved total victory during the past three seasons, the prize money had been rolled over to this season). If no competitor achieved total victory, the competitor who made the furthest than any other competitor (also known as the Last Man Standing) would receive the cash prize of AU$100,000.

Just like on the past two seasons, the grand final on this season was run over in two episodes, with the first episode being served for Stage One and the second episode (season finale) being served for Stage Two and so on.

Obstacles
① Snake Run

② Rolling Log

③ Diving Boards

④ Ring Turn

⑤ Flying Shelf Grab

⑥ Warped Wall

⑦ Ferris Wheel

⑧ Spider Jump

⑨ Chimney Sweep

Time limit: 225 seconds.

Stage Two
Stage two was filmed without any people on the sideline. All family members, friends, and fellow ninjas were in the cameras. However, when Ben Polson was seen doing his run, Olivia Vivian was allowed on the sidelines as she was also through to Stage 2, and vice versa.

Obstacles
① Rope Jungle

② Spin Hopper

③ Salmon Ladder to Unstable Bridge

④ Wing Nuts

⑤ Cat Grab

⑥ Wall Lift

Time limit: 135 seconds.

Obstacles
① Hang Climb

② Body Prop

③ Crazy Cliffhanger

④ Floating Doors

⑤ Flying Bar

Obstacles
① Rope Climb (20 meters)

Time limit: 30 seconds.