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grarrl keno

Grarrl Keno

World: Trophies:
Neopoint Ratio:

Keno is a game found in many real-life casinos, but it exists on Neopets with a Tyrannian twist.

How to Play

Every round of Grarrl Keno has 80 eggs. Of those 80 eggs, 10 of them are going to hatch. Your job is to guess which ones are the hatchers!

To make your guesses, all you have to do is check off the eggs you think will hatch. You can pick anywhere between 2 and 10 eggs to bet on. The number of eggs you choose will determine how many of those need to hatch in order for you to win a Neopoint reward as shown the table below.

Next you need to fill in the “Bet” box at the bottom, to decide how much you want to wager. The minimum bet you can place is 1 Neopoint, while the maximum is based on the age of your account. You are allowed to bet 50 Neopoints plus another 2 NP for every day you have been playing Neopets. You can see your max bet value in bold at the top of the game page. There is an effective cap of 9,999 Neopoints because the bet box only permits up to 4 digits.

Since this game is based on luck, there is no special strategy for picking numbers. You can use your “lucky numbers” if you have any, you could click at random or you could let the game decide by clicking “Quick Pick” to randomise the selection. Once you’re done, simply press “Hatch Those Eggs!” to get started.

Prizes

Based on how many guesses you make and how many of those guesses are correct, your prize will be your bet times a multiplier given in the table below. For example, if you bet 100 Neopoints and make 10 guesses, and 6 of those guesses are correct, your multiplier is x30 and so you would get 100 * 30 = 3,000 Neopoints as a prize.

# Matches # Bets
10 9 8 7 6 5 4 3 2
0 x1 x1 x0 x0 x0 x0 x0 x0 x0
1 x0 x0 x0 x0 x0 x0 x0 x0 x1
2 x0 x0 x0 x0 x0 x1 x2 x3 x5
3 x0 x0 x0 x1 x2 x2 x5 x25
4 x0 x1 x4 x5 x8 x10 x80
5 x2 x2 x8 x15 x50 x600
6 x30 x20 x40 x250 x1,500
7 x100 x80 x400 x5,000
8 x500 x2,500 x10,000
9 x3,000 x15,000
10 x30,000

Based on these payouts, you can determine the expected values for each number of bets. As you’d expect from any casino game, none of them are good for you, though some of them are especially worse than others!

  • 10 bets: -0.751
  • 9 bets: -0.705
  • 8 bets: -0.969
  • 7 bets: -0.943
  • 6 bets: -0.939
  • 5 bets: -0.859
  • 4 bets: -0.825
  • 3 bets: -0.848
  • 2 bets: -0.707

Max Bet Calculator

In case you’d rather do the bet calculating yourself, here’s a nifty calculator so you can figure out how much you can bet at a certain account age. Either enter the number of days, or the amount you wish to bet, and click the appropriate “Calculate” button to figure out how many days you need or how much you can bet!

Quick-Betting

If you’re looking to play the game multiple times quickly, we recommend this tip from Moosa: select your numbers and enter your bet, hatch the eggs, and then hit the refresh button at the results page if you don’t win. Doing this will generate a new, random set of 10 eggs to hatch while keeping the eggs and bet you picked from the previous round. This isn’t against the rules as you will still be charged for each time you refresh, it’s just quicker than going through the whole process over and over.

This method is especially great if you’re just aiming for the avatar, and you can make your bet just 1 NP!

Grarrl Keno / Guide

Randomly awarded when playing Grarrl Keno. It’s been found to be awarded most often when 4 or more numbers are matched.

Released: October 4, 2004

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This game guide was written by: 1337

Grarrl Keno World: Trophies: Neopoint Ratio: Keno is a game found in many real-life casinos, but it exists on Neopets with a Tyrannian twist. How to Play Every round

Grarrl Keno Expected Value and Odds: A guide to not be fooled

#1 InsertUsername

Keno is usually a game where you choose 1 to 20 number between 1 and 80, then 20 number is chosen by the machine/casino. The payoff is determined by the amount of number you chose. The odds of keno can be a little confusing, due to its sheer amount of number you can choose and the fact that it is a draw without replacement. Keno has been dissected by some mathematicians and you can easily find some odds calculator for it on the net.

Grarrl Keno has however a little trick under its sleeve

If you already played it, you know that there’s only 10 draw. This makes all the difference since it horribly change the odds. So, how do we calculate the odds now, you may ask? Well, I found a calculator (I could have done it by hand, but you know, if there is already a program that makes it for you, might as well use it.) that makes calculation for any kind of draw without replacement. You can find the calculator here, if you don’t mind French 😡

A godsend tools for our purpose

So now that we have the odds for each possible outcome, we can actually calculate the expected profit. I tripped over my choice of word in my other thread about Coconut Shy, but I’ll explain what exactly is the expected profit and expected value for non-mathematics academic. The expected value, without going too deep in the subject, is a way to find the mean of a numeric outcome if the draw is infinite. The most notorious example is the expected value of a six sided dice, which is 3.5. That value means that if we roll the dice infinitely, the mean of the numeric outcome is 3.5.

Example of a six sided dice. As you can see, the formula is the sum of all

the outcome multiplied by their respective probability .

The expected profit is actually an application of the expected value. Some reference does not even makes a distinction between both of these terms. Instead of multiplying the different outcome of the random experiment with their respective probability, it is the profit that the outcome gives that you multiply by its probability. For example, if you bet 1$ on a game of head or tail, and if you win, you get 2.25$ back. You have 1/2 chance of losing 1$ and 1/2 chance of winning a profit of 1.25$. If you play infinitely, you can expect a profit of approximately 0.125$.

(Calculated with Maple 2015.1 Build 1059989)

Expected value and expected profit are heavily used in gambling and insurance industry. They are used in gambling to know how much the host win or lose per customer, if there is enough customer to be considered infinite (casino usually fit this description). We can use it to determine how much neopoints in average you lose or win per game while playing Grarrl Keno (spoiler alert: you don’t win). Of course we need a really big number of play for this to be a good average, and no one will play that much, right? Unless. You’re going for the avatar.

Oh, sweet sweet avie

Therefore, I made an Excel sheets that calculate the expected value for every amount of number chosen by the player, so I can laugh at those who chose 10 number and refreshed (or not, you probably make 1000 times the amount you loss, but oh well, I love statistics).

Example of an Excel sheets that I made.

I used a bet of 1 neopoint.

There’s my results (the value are rounded to two significant numbers):

2 numbers chosen has an expected profit of -0.71

3 numbers chosen has an expected profit of -0.85

4 numbers chosen has an expected profit of -0.83

5 numbers chosen has an expected profit of -0.86

6 numbers chosen has an expected profit of -0.94

7 numbers chosen has an expected profit of -0.94 (slightly lower than 6 number chosen)

8 numbers chosen has an expected profit of -0.97

9 numbers chosen has an expected profit of -0.71 (very slightly higher than 2 number chosen)

10 numbers chosen has an expected profit of -0.75

What does all that means?

Those number are actually a percentage of the neopoints you will gain (since they are negative, you have a negative gain, so a loss). So, if you choose 10 number, you will lose 75% of the total neopoints you will gamble. You will lose around 71% of the total amount you gamble at Grarrl Keno if you choose nine or two numbers. Nine numbers is slightly better than two, but it is statistically negligible. It’s kinda nice to know that if you choose 8 number, you will lose 97% of your total gambled neopoints though. Totally a fair game, am I right?

TL;DR

Grarrl Keno is one of the worst gambling game on Neopets. You have way more chance at Bagatelle, which is inherently rigged. Congratulation TNT for making this huge NP sinks.

Every Excel sheets I made are in the zipped file I uploaded right below. Feel free to point out possible error on my part, I will correct them.

Attached Files
  • Grarrl Keno Expected Value.zip76.29KB 5 downloads

Edited by InsertUsername, 07 February 2018 – 04:51 PM.

Grarrl Keno Expected Value and Odds: A guide to not be fooled – posted in Neopet Game Guides: Keno is usually a game where you choose 1 to 20 number between 1 and 80, then 20 number is chosen by the machine/casino. The payoff is determined by the amount of number you chose. The odds of keno can be a little confusing, due to its sheer amount of number you can choose and the fact that it is a draw without replacement. Keno has been dissected by some mathematicians and you can easily fin… ]]>