This game from Math Games with Bad Drawings can be played with 1 to 30 people. Everyone has an empty 5 by 5 grid. A random number from 1 to 10 is chosen, and everyone must place it into their grid. After the grid is filled a score is computed. On each row, circle any groups with 2 or more of the same number, and add these circled numbers. Do the same for each column. The score is the sum of these numbers.

Neighbors.java

import java.util.Scanner;
/**
 * Write a description of class Neighbors here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Neighbors
{
    private Grid[] boards;
    private int n;
    public Neighbors(int n){
        this.n = n;
        boards = new Grid[n];
        for (int i = 0; i < n; i++){
            boards[i] = new Grid();
        }
    }
 
    public Grid get(int i){
        return boards[i];
    }
 
    public String toString(){
        String result = "";   
        for (int i = 0; i< n; i++){
            result += "\nPlayer "+(1+i)+":\n";
            result += boards[i].toString()+"\n";
 
        }
        return result;
    }
    public static int getInt(Scanner kb, String prompt){
        System.out.print(prompt);
        String num = kb.nextLine();
        int result = "012345".indexOf(num);
        if (result <0) {
             System.out.println("Type a number from 1 to 5");
             return getInt(kb, prompt);
        }
        return result;
    }
    public static void testScoring(){
        int[][] arr1 = {{8, 8, 4, 4, 3},
                        {8, 8, 1, 4, 3},
                        {6, 7,10, 7, 3},
                        {6, 6, 5, 7, 7},
                        {2, 2, 5, 9, 9}};//85
        Grid g1 = new Grid(arr1);
        int[][] arr2 ={ {2, 2, 3, 3, 7},
                        {8, 8, 3, 7, 7},
                        {8, 8,10, 7, 9},
                        {4, 5, 6, 6, 5},
                        {4, 4, 6, 1, 5}};//100
        Grid g2 = new Grid(arr2);
        int[][] arr3 ={ {6, 8, 8, 1, 7},
                        {6, 6, 8, 8, 7},
                        {5,10, 3, 9, 7},
                        {5, 4, 4, 9, 7},
                        {2, 2, 4, 3, 3}};//92
        Grid g3 = new Grid(arr3);
        System.out.println( g1 +"\nscore:" + g1.score() + "(Should be 173)");
        System.out.println( g2 +"\nscore:" + g2.score() + "(Should be 172)");
        System.out.println( g3 +"\nscore:" + g3.score() + "(Should be 154)");
    }
    public static void main(String[] args)
    {        
        Scanner kb = new Scanner(System.in);
        System.out.print("How many players? ");
        String line = kb.nextLine();
        int n = Integer.parseInt(line);
        Neighbors game = new Neighbors(n);
        //System.out.println(game);
        for (int i = 1; i <= 25; i++){
            int roll = 1 + (int)(10*Math.random());
            System.out.println("Random Number "+i+" is "+roll);
            for (int player = 0; player < n; player++){
                System.out.println(game);
                boolean okay;
                do { 
                    String prompt = "Player "+(player+1)+", choose a row (1 to 5) to place "+roll+":";
                    int row = getInt(kb, prompt);
                    prompt = "Player "+(player+1)+", choose a column (1 to 5):";
                    int col = getInt(kb, prompt);
                    okay = game.get(player).set(roll, row, col); 
                } while (!okay);
 
            }
        }
        System.out.println(game);
    }
 
}

Grid.java

/**
 * Write a description of class Grid here.
 *
 * @author 
 * @version (a version number or a date)
 */
public class Grid
{
    // instance variables - replace the example below with your own
    private int[][] grid;
 
    /**
     * Constructor for objects of class Grid
     */
    public Grid()
    {
        grid = new int[5][5];
    }
    public Grid(int[][] arr){
        grid = arr;
    }
    public boolean set(int number, int row, int col){
        if (grid[row-1][col-1] > 0)
            return false;
        grid[row-1][col-1] = number;
        return true;
    }
    public int score(){
        int total = 0;
        for (int[] row: grid){
            int b = 0;
            int e;
            do {              
                e = b+1;
                int run = 1;
                int value = row[b];
                while ( e < 5 && row[b]==row[e]){
                    run++;
                    e++;
                }
                if (run >1)
                    total += run*row[b];               
                b =e ;
            }while (e < 5);   
        }
        //columns
        System.out.println(" row total:"+total);
        for(int col =0; col < 5 ; col++){
            int b = 0;
            int e;
            do {
                e = b+ 1;
                int run =1;
                int value = grid[b][col];
                while ( e < 5 && grid[b][col] == grid[e][col]){
                    run++;
                    e++;
                }
                if (run >1 )
                    total += run*grid[b][col];
                b = e;
            }while (e<5);
        }
         return total;
    }
    public String toString()
    {
        String result="|";
        for (int[] row: grid){
            for(int cell: row)
            {
                if(cell<10)
                   result += " ";
                result +=  + cell +" |";
            }
            result += "\n|";
        }
        int last = result.length()-2;
        return result.substring(0, last)+ "Score: "+score();
    }
}

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