This figure is a useful guideline for determining a machine's potential profitability, even though it is based on long-term play and does not guarantee individua909u casino slots crashl outcomes. With this knowledge, you can decide which slot machines to play and which to stay away from. Selecting a Machine Based on Your Interests. Ultimately, picking a slot machine that appeals to you can improve your playtime enjoyment and engagement, whether it's a favorite theme or a particular gameplay element.