private IEnumerator SpawnCollectables()
    {
        while (true)
        {
            yield return(new WaitForSeconds(spawnTime));

            int   chosen   = 0;
            float location = Random.Range(-9, 9);

            int chance = Random.Range(0, 100);

            if (chance <= gemChance)
            {
                chosen = 0;
            }
            else if (chance <= fuelChance)
            {
                chosen = 1;
            }
            else   //Chooses Explosive
            {
                chosen = 2;
            }
            GameObject collectable = Instantiate(collectables[chosen], new Vector3(transform.position.x + location, transform.position.y, 0), Quaternion.identity);
            if (chosen == 0)
            {
                GemController gem = collectable.GetComponent <GemController>();
                gem.DefineGem((int)(Time.frameCount / 60));
            }
        }
    }