Not too long after, several improvements were made to the machines, including lighter materials that made them much easier to transport. Some of the other improvements were replacing the heavy iron with a wood cabinet making the process of transporting and delivering the slot machine game much easier still. Around the same time, some of the casino slot games started being redone with mini themes, such as patriotic, wildlife, etc.
Many of the changes that the slot machines went through, including the vibrant colors and themes were good, but the younger players were looking for something more challenging and skill based. So, for a short period of time the slot game waned in popularity, then the generational changes that seemed to boost the slots back into popularity occurred shortly after the depression. Some of the changes included video poker and video slot machines seen in the gambling hubs like Las Vegas and Atlantic City.