Roulette vs Paper Lottery vs Ghost Leg: Comparing Lottery Methods by Fairness, Transparency, and Usability

Whether it is distributing prizes at an event, assigning roles, or dividing teams, situations that call for a lottery come up often. With so many options available, from roulette to paper lotteries to ghost leg drawings, knowing the characteristics of each method makes the decision much easier.

This article compares six major lottery methods from the perspectives of fairness, transparency, and usability, and offers guidance on choosing the right one for your situation.

6 Major Lottery Methods

1. Paper Lottery

Write numbers or outcomes on slips of paper, place them in envelopes or a box, and have participants draw. This classic method requires nothing more than paper and a pen, and everyone immediately understands how it works. No internet is needed, and it has a warm, analog charm.

On the other hand, everyone must be in the same location, and because no one can verify the contents before drawing, transparency is somewhat limited. There is also a risk of duplicates or missing entries, making it unsuitable for large groups. Paper lotteries work best for in-person gatherings of 10 people or fewer, or when you want to preserve an analog atmosphere.

2. Garapon (Lottery Machine)

A lottery machine spins numbered balls inside a transparent container, and participants turn a handle to draw one out. The visible contents make the process easy to follow, and the physical act of turning the handle adds to the event excitement.

However, you need to rent or purchase the equipment, and transporting and setting up the machine can be a challenge. It cannot be used online, so the garapon is best suited for large in-person events, festivals, year-end parties, and other occasions where presentation matters.

3. Roulette (Web/App)

Names or numbers are placed on a circular wheel, and pressing a button spins it. The winner is determined by where the wheel stops. Flashy animations make it visually entertaining, and with many free tools available that work on smartphones, it is easy to use.

The downside is that only the organizer operates the roulette, making it a one-directional process. The algorithm behind it is opaque, which can leave lingering doubts about whether the result is truly random. Roulette is a good fit for casual events with small groups where trust is already established, or when visual presentation is the priority.

4. Random Selection Tools (Excel/Google Sheets)

Using RAND or RANDBETWEEN functions in Excel or Google Sheets to generate random numbers. This method leverages existing software, can handle large datasets, offers high customizability, and comes at no additional cost.

However, formula knowledge is required, explaining the process to others can be difficult, and questions like "couldn't you just change the formula?" tend to arise. This approach works best for internal administrative lotteries, situations where data is already in a spreadsheet, or small groups with established trust.

5. Rock-Paper-Scissors

A simple method where participants compete with rock, paper, or scissors, and the winner takes the prize. No preparation is needed, everyone knows the rules, and a decision can be made on the spot. The process is completely transparent and naturally creates excitement.

The drawbacks are frequent ties that consume time, difficulty scaling to larger groups, and the possibility that psychological tactics can affect fairness. Rock-paper-scissors is ideal for casual, spur-of-the-moment decisions with 2 to 5 people.

6. Ghost Leg (Online)

A diagram of vertical and horizontal lines where all participants add horizontal rungs, then trace their path to determine the outcome. One-to-one correspondence is mathematically guaranteed, and because every participant contributes to the process, no one can manipulate the result. It works both online and offline, supports up to 299 participants, and can be easily shared via URL.

The online version requires an internet connection, and first-time users may need a brief explanation. Ghost leg is well suited for situations where fairness and transparency are paramount, including online events, company parties, and scenarios with remote participants.

Detailed Comparison Table

Item	Paper Lottery	Garapon	Roulette	Excel	Rock-Paper-Scissors	Ghost Leg
Fairness	○	○	△	○	△	◎
Transparency	△	○	△	△	◎	◎
Usability	○	△	○	△	○	○
Setup Time	5-15 min	30-60 min	1-5 min	5-10 min	0 min	1-5 min
Capacity	10 or less	100 or less	No limit	No limit	5 or less	Up to 299
Online Support	×	×	○	○	△	◎
Cost	Free	Paid	Free	Free	Free	Free
Participatory	△	△	×	×	◎	◎
Recording	△	△	○	◎	×	◎

Scientific Analysis of Fairness

A fair lottery means that all outcomes appear with equal probability (equal probability), that previous results do not influence the next one (independence), that results cannot be predicted in advance (unpredictability), and that every participant receives a different outcome (one-to-one correspondence). A method can only be considered mathematically fair when all four of these elements are satisfied.

With ghost leg, the positions of the horizontal rungs ensure that all paths are equally probable, and because a new drawing is created each time, independence is also maintained. With three or more rungs, prediction becomes effectively impossible, and one-to-one correspondence is mathematically guaranteed. Ghost leg stands out among the other methods by satisfying all four conditions at a high level. For more details, see How to Scientifically Prove Lottery Fairness.

Roulette depends on its algorithm, so equal probability can vary, and the limitations of pseudo-random number generators mean unpredictability is somewhat weaker. Rock-paper-scissors is influenced by psychological factors and opponent habits, and because ties and multiple winners can occur, one-to-one correspondence does not hold.

Recommended Lottery Methods by Scenario

Corporate Events (Prize Distribution)

For corporate events with 50 to 200 people, you need fairness and transparency along with a sense of excitement. Online ghost leg is a participatory format that delivers high satisfaction, allows remote employees to join, and can create excitement with a 3D presentation. Records are preserved for later review. If you have the budget and the event is in person, a garapon is also an option.

Small Gatherings (Choosing an Organizer)

For gatherings of 5 to 15 people, the balance between convenience and satisfaction matters most. If you want an instant decision, go with rock-paper-scissors. If fairness is the priority, ghost leg is the better choice. If you have time to prepare in advance, a paper lottery works as well.

School Role Assignment

For classes of 20 to 40 students, fairness and educational value are both important. Online ghost leg visualizes the process, providing experience with democratic decision-making and improving digital literacy. Combining discussion with a lottery is also an effective approach.

Online Seminars (Participant Prizes)

For online seminars with 100 to 300 participants, transparency and large-group support are essential. Online ghost leg supports up to 299 people, can be easily shared via URL, and can be conducted through Zoom screen sharing. If you can sufficiently explain its reliability, a random selection tool is also a viable alternative.

Large Events (Visitor Prizes)

For large events with 500 or more attendees, efficiency and presentation take center stage. A garapon works well as a stage event, while a digital lottery system is better when efficiency is the priority. When running prize drawings, be sure to review the legal considerations in advance.

Frequently Asked Questions

Q1: Which is the fairest lottery method?

Mathematically, ghost leg is the fairest. One-to-one correspondence is mathematically guaranteed, all participants are involved in the process, transparency is extremely high, and unpredictability is also ensured.

Q2: Are online lottery tools trustworthy?

It depends on the tool. A trustworthy tool should have a visible process, a mechanism that involves all participants, and a design that prevents the organizer from being the sole operator.

Q3: Which creates more excitement, roulette or ghost leg?

Roulette generates temporary excitement through flashy animations, while ghost leg creates a sustained sense of unity through full participation. If presentation is the goal, choose roulette. If satisfaction and buy-in matter more, choose ghost leg.

Summary

The best lottery method depends on the scale and purpose of your event. If fairness and transparency are your top priorities, online ghost leg is the strongest choice. For quick decisions in small groups, rock-paper-scissors works well. For in-person excitement with a budget, consider a garapon. For easy, casual use, roulette or Excel are solid options.

Understanding the strengths and weaknesses of each method will help you choose the right lottery approach for your situation and create a fair, satisfying event.