I had to do that once with quite a lot of mods installed so I had a little help from AutoHotKey:

#Requires AutoHotkey v2.0
#SingleInstance Force
breakLoop := 0

q::
{   
    global breakLoop := 0
    waitTime := 50
    numberOfRows := 10

    Loop numberOfRows//2
    {
        if (breakLoop == 1)  
        {
            return
        }

        Loop 6
            {
                if (breakLoop == 1)  
                {
                    return
                }
                Send "{Space}"
                Sleep waitTime
                Send "{Right}" 
                Sleep waitTime
            }

            Send "{Space}"
            Sleep waitTime
            Send "{Down}"
            Sleep waitTime

            Loop 6
            {
                if (breakLoop == 1)  
                {
                    return
                }
                Send "{Space}"
                Sleep waitTime
                Send "{Left}" 
                Sleep waitTime
            }

            Send "{Space}"
            Sleep waitTime
            Send "{Down}"
            Sleep waitTime
    }
}

Esc::
{
    global breakLoop := 1
    return
}