RobotRobot: New page: multibot rules (SPARC, NHRL), walker/shuffler definitions and weight bonuses, notable examples

2026-10-17T06:29:12Z

New page: multibot rules (SPARC, NHRL), walker/shuffler definitions and weight bonuses, notable examples

New page

Most combat robots are a single machine on wheels, but the rules also allow some unusual designs: '''multibots''', made of several separate robots that fight as one entry, and robots that '''walk''' or '''shuffle''' instead of rolling. These designs are rare and often tricky, but rule sets reward them with extra weight. This page explains how the main rule sets treat them. Always confirm with your event before building one.

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==Multibots==
A multibot (also called a clusterbot) is an entry made of two or more separate robots ("segments") that together make up the weight limit.

===SPARC rules===
* Under the '''[[SPARC Match Rules]]''', the knock-out count for a multibot starts when at least 51% of its total mass can't move. A segment that's heavy enough to meet that threshold on its own needs a visual identifier, so the referee knows which part matters.
* All the segments of a multibot share a single un-stick.[https://sparc.tools/SPARC_Match_Rules_v1.6.pdf]
* SPARC doesn't give multibots extra weight.

===NHRL rules===
NHRL (3, 12 and 30 lb classes) gives multibots a weight bonus, with more detailed rules:[https://wiki.nhrl.io/wiki/index.php?title=NHRL_Rules]
* Up to 4 segments. Using the bonus raises the total weight to 4 lb, 16 lb or 40 lb (for the 3, 12 and 30 lb classes), split evenly between the segments, and the segments can't start the match connected.
* Every segment must be mobile, have an active weapon, and have its own receiver and failsafe.
* The knock-out count starts when the majority of segments are immobile.

===Pros and cons===
* Opponents have to deal with more than one robot, which can make a multibot hard to knock out.
* Each segment is lighter, so it's easier to throw around or pin, and needs its own radio, battery and electronics.
* Segments with spinning weapons can hit each other.
* Driving two robots at once takes a lot of practice.

===Notable multibots===
* '''Gemini''' (Robot Wars) – the show's first clusterbot, two flipper halves that fought in Series 4 and 5.
* '''Gemini''' (BattleBots) – a different robot: two vertical-disc spinners, first seen in the 2016 season, known for rarely being knocked out.
* '''The Swarm''' – five lightweight robots in Robot Wars Series 10.

==Walkers and shufflers==
===Definitions and weight bonuses (SPARC)===
The '''[[SPARC Robot Construction Specifications]]''' (v1.7) give these locomotion weight bonuses:[https://sparc.tools/SPARC_Robot_Construction_Specifications_v1.7.pdf]
{| class="wikitable"
! Type !! Definition (summary) !! Bonus !! Example: 1 lb class !! Example: 3 lb class
|-
| '''Shuffler''' || Legs operated by rotating cams || 1.25× || 1.25 lb || 3.75 lb
|-
| '''Non-traditional''' || Bristle or vibration drives, gyro walkers, hovercraft (and, at some events, jumping or flying) || 1.5× || 1.5 lb || 4.5 lb
|-
| '''Walker''' || No rolling parts touching the floor, and no continuous rolling or cam-operated motion touching the floor, directly or through a linkage || 2× || 2 lb || 6 lb
|}
SPARC defines "continuous" motion as motion where running the drive motor continuously makes the robot move continuously. Legs driven by linear actuators, and other novel non-wheeled drives, may qualify as walkers.

===What counts as walking?===
This is where most designs run into trouble. A classic walking linkage such as a Jansen or Klann linkage, turned by a continuously running motor, produces continuous motion through a linkage – so under the SPARC wording it likely doesn't qualify for the 2× walker bonus, and would usually be treated as a shuffler. Legs driven by linear actuators or individually controlled servos are what the walker bonus is aimed at. This is a reading of the rule text rather than an official ruling, so '''contact the event early''' and describe your design – SPARC itself asks builders of non-wheeled robots to do this.

===NHRL===
NHRL adds extra weight for "true walkers" (robots that use legs, doubling the class weight) and for non-traditional drives (1.5×; NHRL counts shufflers as non-traditional). Walkers need approval before registration, and a multibot only gets a locomotion bonus if every segment qualifies.[https://wiki.nhrl.io/wiki/index.php?title=NHRL_Rules]

===Notable walkers and shufflers===
* '''Mechadon''' – a six-legged superheavyweight walker that debuted at BattleBots Long Beach in 1999.
* '''Son of Whyachi''' – a cam-driven shuffler that won the BattleBots Season 3.0 heavyweight title, leading BattleBots to treat shufflers separately from true walkers.[https://battlebots.fandom.com/wiki/Shufflebots]
* '''Game Over''' – a 3 lb, servo-driven four-legged walker at NHRL.[https://nhrl.io/wiki/index.php/Game_Over]

==See also==
* '''[[RobotClasses|Robot Classes]]''' – weight classes and bonuses
* '''[[Drive Systems]]'''
* '''[[Melty Brain]]''' – another unusual drive system
* '''[[Servos]]''' – for servo-driven legs

Multibots, Walkers and Shufflers - Revision history

RobotRobot: New page: multibot rules (SPARC, NHRL), walker/shuffler definitions and weight bonuses, notable examples