A ruby based minesweeper command line game

Minesweep.rb

def minesweeper(size,mines)
	@gamestate = "Ongoing"
	@size = size
	@number_of_squares = size * size 
	@mines = mines
	@mine_grid = []
	@count = 0 
	@clicks = []
	@clicks.push()
	@size.times do
		@mine_grid[@count] = []
		@size.times do 
			@mine_grid[@count].push(0)
		end
		@count += 1 
	end
	time = @mines
	time.times  do
		while !try_to_fill?
		end
	end 
end

def try_to_fill?
	x = rand(@size) 
	y = rand(@size) 
	if !@mine_grid[x][y].is_a?(String)
		@mine_grid[x][y] = "M"
		increment_nearby(x,y)
		return true
	else
		return false
	end
end

def increment_nearby(x,y)
	max_size = @size -1 
	min_x = [x-1,0].max
	min_y = [y-1,0].max
	max_x = [x+1,max_size].min
	max_y = [y+1,max_size].min
	(min_x..max_x).each do |x_index|
		(min_y..max_y).each do |y_index|
			if @mine_grid[x_index][y_index] != "M"
				@mine_grid[x_index][y_index] = @mine_grid[x_index][y_index].to_i + 1 
			end
		end
	end
end

def cascade_nearby(x,y)
	if !@clicks.include?([x,y])
		@clicks.push([x,y])
	end
	max_size = @size -1 
	min_x = [x-1,0].max
	min_y = [y-1,0].max
	max_x = [x+1,max_size].min
	max_y = [y+1,max_size].min
	(min_x..max_x).each do |x_index|
		(min_y..max_y).each do |y_index|
			if (@mine_grid[x_index][y_index] != "M") && !@clicks.include?([x_index,y_index])
				if @mine_grid[x_index][y_index] == 0
					cascade_nearby(x_index,y_index)
				else
					@clicks.push([x_index,y_index])
				end
			end
		end
	end
end


def show_grid 
	@mine_grid.each_with_index do |yrow,xindex|
		counter = 0 
		row = []
		@mine_grid[xindex].each_with_index do |xrow,yindex|
			if @clicks.include?([xindex,yindex])
				row.push(@mine_grid[xindex][yindex])
			else  
				row.push(".")
			end
		end
		puts row.join(" ")
	end
	#ap @clicks
end

def prompt_user
	puts "please pick another coordinate, comma delimited"
end


def check_square(x,y)
	if @mine_grid[x][y] != "M"
		click_square(x,y)
	else
		@gamestate = "Boom"
	end
end

def click_square(x,y)
	@clicks.push([x,y])
	cascade_nearby(x,y)
	if @clicks.length == (@number_of_squares - @mines)
		@gamestate = "Victory"
	end
end
minesweeper(10,10)
while @gamestate == "Ongoing"
	show_grid
	prompt_user
	input = gets 
	x,y = input.split(",")
	x = x.to_i
	y = y.to_i
	if !@clicks.include?([x,y])
		check_square(x,y)
	end
end
puts "Game Over: #{@gamestate}"