Penny slots machines have several lines or slots, which can accept various denominations of coins. In recent years, slot-machine makers have increased the number of slots unlike in the past when one or two slots were available for only a few denomination coins. Penny slots can now accept various coins in the several lines that have been added, with some even accepting different denominations within the same slot, making it flexible for all types of gamblers who have different amounts of money.
What is even more exciting is the fact that a gambler can even play multiple coins per spin o the slot machines of today. This means that they will input different coin denominations in the different lines (or even the same slots) before revving the machine for a gambling spin. This increases chances of a win and more cash per win.
As a result, gamblers can sometimes be enticed to the extent that they spend even more than they would on the old slot machines, which required one to use specific denominations. This is just one of the many tricks being used by the gaming industry using penny slots to maximize profits as the industry undergoes major revolutions in the pursuit of profits.