Domino Effect

Domino Effect (also known as Backed Up, High Step and Stack, and High Step Back) is a recurring challenge from . It debuted in and has since re-appeared in , , , , and .
==Rules==
Castaways must stack all of their blocks like a line of domino tiles on an angular beam while avoiding tripwires that would topple the blocks that were already stacked. Once all of the blocks have been properly stacked in such a way that they were evenly spaced to topple like dominoes that would reach the end of the beam, the castaway would start a chain reaction which would trigger a mechanism that will release a ball rolling to a bowl, releasing a flag/breaking a tile. The first castaway to raise their flag/break their tile would win.
In , , and , the challenge was slightly modified so that the beam was now straight, and with the obstacle below the beam being a wooden frame that, when shaken, would cause the blocks to fall. Contestants were only allowed to carry one block at a time, unlike in previous iterations where they could carry as many as desired. The first castaway to topple their blocks like dominoes to the end and ring a gong would win.
==History==
=== United States ===
This challenge debuted in  as an Immunity Challenge with an additional first round where castaways would race across a series of balance beams carrying three bags of blocks. The first two castaways to bring all three of their bags would go to the final round, along with Corinne Kaplan, who had bought a Challenge Advantage from the Survivor Auction that allowed her to bypass the first round. In the final round, a race between Corinne, Ken Hoang, and Matty Whitmore to topple all their blocks resulted in Corinne and Matty's blocks failing to reach the end, while Ken's managed to do so, giving him immunity.
In , the challenge was used as the second duel. From this point onwards, the first round in Gabon is no longer used, with the challenge immediately starting with the block portion. In the end, Matt Elrod beat Russell Hantz in, permanently eliminating Russell from the game.
In , the challenge returned as the second Redemption Island duel between Candice Cody, Marissa Peterson, and Rachel Foulger. Instead of tripwires, trip bars were now installed at the foot of each beam. Candice easily won the duel, keeping herself alive. After over 45 minutes in the intense heat, Marissa finally beat Rachel, eliminating Rachel from the game.
In , the challenge appeared as an Immunity Challenge in a slightly altered form. Several castaways had difficulty stacking their blocks as they tripped on the wooden frame obstacle, allowing Julia Sokolowski to topple all of her blocks first, winning immunity.
In , the challenge was again used as an Immunity Challenge and used the same iteration as in Kaôh Rōng. In the end, the challenge came down to a race between Andrea Boehlke, Michaela Bradshaw, Sarah Lacina, and Sierra Dawn Thomas. After quickly re-stacking her blocks, Andrea managed to topple all of her blocks first, winning immunity.
In , the challenge was once again an Immunity Challenge using the same iteration as in Kaôh Rōng. Prior to the challenge, Nick Wilson anonymously played a Challenge Disadvantage against Ben Driebergen, requiring him to stack 30% more blocks on a 30% longer beam. Despite this, Ben, Michele Fitzgerald, Sarah Lacina, and Tony Vlachos were all neck and neck, with Michele ultimately pulling out a clutch immunity win.
=== Australia ===
 introduced a new variant of the challenge. The four competing members of the Fa'amolemole tribe would stand within a circular table suspended by three cables. They must place their tiles through a specific window, rotating the table so as to place more tiles around the table. As the table is rotated, the tension in the cables builds, so the castaways must stabilize the table with one hand and stack their tiles with the other. The first person to knock down all their tiles wins. Matt Sharp narrowly defeated Simon Mee by seconds to secure his third individual Immunity Challenge victory.
A new variant of the challenge appeared at the final seven of . Each castaway had to hold a ring bearing a weight as they stacked their dominoes; if the weight dropped, it would knock over their blocks. On her third attempt at toppling her stack, Kirby Bentley secured her second Immunity Challenge win, narrowly beating out Rianna Bowley to prevent a near-certain elimination.
===France===
=== New Zealand ===
=== South Africa ===
In , the final four competed in the challenge for a spa retreat. The Araw tribe not only had to race against each other, but beat the gusts that constantly toppled each castaway's row of dominoes. In the end, Tom Swartz won his third individual challenge, the spa retreat, and a new Huawei P20 phone.
=== United Kingdom ===
==Winners==
<tabber>United States=
Episode	Challenge Type 	Winners 	Winners
 	Individual Immunity	colspan="2"	
 	Duel 	colspan="2"	
 	Duel 	 	
 	Individual Immunity	colspan="2"	
 	Individual Immunity	colspan="2"	
 	Individual Immunity	colspan="2"	
|-|Australia=
Episode 	Challenge Type 	Winners
Episode 23	Individual Reward/Immunity	
Episode 22	Individual Immunity 	
Episode 6 	Tribal Reward 	
Episode 20	Individual Immunity 	
Episode 21	Individual Immunity 	
Episode 20	Individual Immunity 	
|-|France=
Episode 	Challenge Type 	Winners 	Winners
Episode 13	Individual Immunity 	colspan="2"	
Episode 12	Individual Reward 	colspan="2"	
Episode 13	Individual Immunity(Sudden-Death Challenge)	colspan="2"	
Episode 7 	Re-entry Duel 	 	
Episode 15	Individual Immunity 	colspan="2"	
|-|New Zealand=
Episode 	Challenge Type 	Winners
Episode 13	Individual Reward	
|-|South Africa=
{|class="wikitable" style="margin:auto; text-align:center; font-size: 8pt; white-space:nowrap; line-height:18px;"
! Episode
! Challenge Type
! Winners
|-
| Episode 15
| Individual Reward
| 
|-|United Kingdom=
Episode 	Challenge Type 	Winners
Episode 13	Individual Immunity	
</tabber>
==Gallery==
<tabber>United States=
Domino effect corinne.png|Corinne competes in .
Matt russell due.jpg|Matt and Russell duel in .
Survivor.S27E03.HDTV.x264-LMAO 149.jpg|Marissa and Rachel duel in .
S32 ep9 press images S32 Ep9 SG 0005.jpg|Aubry competes in .
SierraImmunityChallengeGC.jpg|Sierra competes in .
ben high step back.jpg|Ben competing in .
|-|Australia=
AU17Ep23.png|Michelle competing for immunity and a new car in .
AU4EP22.jpg|Abbey and Pia competing for immunity in .
aus10e21 george domino effect.jpg|George competing in .
Aus11e20 mark domino effect.jpg|Mark competing in .
|-|France=
KLS20 Ep13 Domino Effect.jpg|Mathilde competing in .
KLS21 Ep12 Domino Effect.jpg|Romain competing in .
KLS24 Ep13 Domino Effect.jpg|Alexandra competing in .
KLS24 Ep13 Immunity Challenge.png|Claude competing in L'Île des Héros.
Kls27.ep7.png|The challenge in .
KLS29 Ep15.jpg|The challenge in .
KLS29 Ep15 Immunity Challenge.jpg|Tania competing in Le Feu Sacré.
</tabber>
==Trivia==
* Every first-time player to win this challenge was the youngest person of their gender on their season.
* Aubry Bracco, Michele Fitzgerald, Sarah Lacina, and Tai Trang are the only contestants to have competed in this challenge twice. Michele won once, while Aubry, Sarah, and Tai lost both times.
==References==
Category:Survivor (U.S.)
Category:Australian Survivor
Category:Koh-Lanta
Category:Recurring Challenges
Category:Challenges
Category:Survivor: Gabon
Category:Gabon Challenges
Category:Survivor: Redemption Island
Category:Redemption Island Challenges
Category:Survivor: Blood vs. Water
Category:Blood vs. Water Challenges
Category:Survivor: Kaôh Rōng
Category:Kaôh Rōng Challenges
Category:Survivor: Game Changers
Category:Game Changers Challenges
Category:Survivor: Winners at War
Category:Winners at War Challenges
Category:Australian Survivor (2017)
Category:Australian Survivor (2017) Challenges
Category:Australian Survivor: Champions v Contenders (2018)
Category:Champions v Contenders (2018) Challenges
Category:Australian Survivor: All Stars
Category:All Stars Challenges (Australia)
Category:Australian Survivor: Blood v Water
Category:Blood v Water Challenges (Australia)
Category:Australian Survivor: Heroes v Villains
Category:Heroes v Villains Challenges (Australia)
Category:Koh-Lanta: Cambodge
Category:Koh-Lanta: Fidji
Category:Koh-Lanta: L'Île des Héros
Category:Koh-Lanta: La Légende
Category:Koh-Lanta: Le Feu Sacré
Category:Survivor NZ: Thailand
Category:Thailand Challenges (New Zealand)
Category:Survivor South Africa: Philippines
Category:Philippines Challenges (South Africa)