-- Change absolutely whatever you need to, even if it says you shouldn't

gamebar = paintutils.loadImage("/sprites/bars/.game1")
------------ General Settings ------------

------ Required Internal ------
-- Changing anything in this section isn't recommended
local width, height = term.getSize() -- Must be defined before Gem Settings

------ Gem Settings ------
-- The number of gems to have on the screen at all times
local gemsOnScreen = 10
-- The minimum x coordinate that a gem can be generated at
local minX = 13
-- The minimum y coordinate that a gem can be generated at
local minY = 4
-- The maximum x coordinate that a gem can be generated at
local maxX = 47
-- The maximum y coordinate that a gem can be generated at
local maxY = height - 1
-- List of possible gem colors
local colorChoices = { colors.purple, colors.yellow, colors.lime, colors.lightBlue }
-- Define the gem worth value (money received when clicked)
local gemValue = { }
gemValue[colors.purple] = 10 -- Get 10 money when you click a purple gem
gemValue[colors.yellow] = 5 -- Get 5 money when you click a pink gem
gemValue[colors.lime] = 15 -- Get 15 money when you click a lime gem
gemValue[colors.lightBlue] = 20 -- Get 20 money when you click a blue gem

------ Screen Settings ------
-- Background color
local bgColor = colors.red
-- Text color
local txtColor = colors.white

------------ Internals ------------

------ User Data ------
local money = 0
local gemsClicked = 0
local multi = 1
local multiCost = 100 -- add new variable for multiCost

------ Gem Data ------
-- Table that stores the pixel data (coordinates and color)
local gems = { }

------------ Functions ------------

local function buymultiply() -- make a function out of it so you can use it where you need it
if money >= multiCost then  -- should be > else you only can buy it when you have exactly this amount
multiCost = multiCost*2
 multi = multi+1
end
end

function newGem()
    local w, h = term.getSize()
    local x, y

    -- Pick a random spot for the pixel to appear
    while true do
        x = math.random(minX, maxX) -- Random number for the x coordinate
        y = math.random(minY, maxY) -- Random number for the y coordinate
        if #gems > 0 then
            local good = true
            for i, v in ipairs(gems) do
                -- Check to see if a gem already exists in that position
                if v[1] == x and v[2] == y then good = false end
            end
            if good then break end
        else
            break
        end
    end

    -- Now, we choose a random color for the pixel (maybe you don't need this)
    local color = colorChoices[math.random(1, #colorChoices)]

    -- This holds the coordinates and the color of the gem
    local gem = {x, y, color}
    table.insert(gems, gem) -- Adds the gem data to the main table

    -- Draw the gem
    term.setCursorPos(x, y)
    term.setBackgroundColor(color)
    write(" ")
    term.setBackgroundColor(bgColor)
end

function spawnGems(n)
    for i = 1, n do
        newGem()
    end
end

function stats()
    paintutils.drawImage(gamebar, 1,1)
    term.setCursorPos(1,1)
    -- You don't need term.setCursorPos(1, 2) since print automatically moves a line down each time
    print("Money: "..money)
    print("Gems: "..gemsClicked)
    print("Multiplier: ")
    print(multi.."x")
    print("")
    print("Upgrades:")
    print("Multiplier")
    print("Price:")
    print(multiCost)
end
------------ Running Code ------------

-- Don't use a number for the color unless absolutely nessecary...and I have no idea when it would be
-- Use the colors API. 16384 is the same as saying colors.red
term.setBackgroundColor(bgColor)
term.setTextColor(txtColor)
term.clear()
spawnGems(gemsOnScreen)
stats()

while true do
    local e, p1, p2, p3 = os.pullEvent("mouse_click")
    -- Check if the coordinates clicked are any of the pixel's coordinates
    if  p1 >= 1 and p1 <= 11 and p2 == 7 then  -- im not sure about this but i thik this should work cause needs to be checked after click and has to be outside the loop for getting gemcoords
        buymultiply()
    end
    for i, v in ipairs(gems) do
        if p1 == 1 and v[1] == p2 and v[2] == p3 then -- A gem was LEFT clicked
            -- Do stuff here
            -- Do more stuff
            -- Increment variables
            gemsClicked = gemsClicked + 1

            -- Give money
            money = money + (gemValue[v[3]] * multi) -- Gem value multiplied by the multiplier

            -- Remove the gem
            term.setBackgroundColor(bgColor)
            term.setCursorPos(v[1], v[2])
            write(" ")
            table.remove(gems, i)

            -- Spawn a new gem
            newGem()

            -- Update stats
            stats()
        end
    end
    sleep(0.05)
end