summon firework_rocket ~ ~ ~ {FireworksItem:{id:"firework_rocket",Count:1,tag:{Fireworks:{Explosions:[{Type:4,Trail:1b,Colors:[I;16711680],FadeColors:[I;16751882]},{Type:4,Trail:1b,Colors:[I;16751882],FadeColors:[I;16711680]},{Type:1,Trail:1b}]}}}}
scoreboard players set gamemanager game_active 0
tellraw @a {"text":"Game has been completed.","color":"gold","italic":false}