With the advent of robust online slot machines, you do not need to set aside a day, travel funds, and an outfit to visit your favorite casino to enjoy playing at a slot machine. Online slot machines are a great choice if you would like to gamble in the comfort of your blankies with a glass of wine in hand.

Online slots are designed differently to suit everyone's individual needs. There are flash-based slots that are better played on a PC and those available on a casino website without having to install any software. Then there are the HTML5 games that are designed to be installed on your iOS or Android smartphone or tablet. HTML5 is still a new design, but there are plenty of excellent games for you to try on your phone:

1. Crystal Cash

Developed by the Ainsworth Casino Software developers, the Crystal Cash slot stands out as you can play without making a deposit. To access it, visit your browser and start playing; no download required. It is secure and absolutely worth a try. You start by creating an account, then enjoy your welcome bonus, and start winning.

2. Orange is the New Black

Show your loyalty and love for this popular show by trying out the Orange Is the New Black online slot machine. It has all the main characters, the TV show's original soundtrack, and clips to keep you entertained as you play.

There are scatter icons on the first three reels, which are Piper in her orange jumpsuit and the crazy eyes free spins, Alex's other symbols, and Piper's all features that combine every element to let you spin them for free. If you get a free spin, you must play a wheel to determine how many free spins you get, plus a multiplier. This slot has tonnes of exciting features that are randomly triggered; but the more you play, the more access you have to them.

Another exciting feature is that you can change your wager, thus making play accessible regardless of your bankroll. The lack of a progressive aspect means that you need not pay huge bets to feed the jackpot. Orange is the new black is a great slot that will entertain you with the spontaneous bonuses and TV show soundtracks.

3. Emerald Smash

A brainchild of Inspired Gaming, this 5-reel 30-payline slot is an exciting option for mobile play, with its crystal-like lemons, grapes, cherries, and all your favorite fruit symbols. The game will be kind on your phone and has excellent graphics to boot.

You can bet €0.30-€90 per spin, and you can change your wager on the paylines if you wish. The average payers on this slot are the grapes, cherries, and lemons, with maximum rewards of €300. From there, you can only go up, with the clover and blue star can give you up to €600, with the red 7 giving you at least €1,500.

The Emerald Smash is this machine's bonus feature. If emerald symbols land on your reels, they will smash up to create or enhance your win. The gameplay is intuitive and fun, but the bonuses are not as competitive.

4. Mystical Unicorn Slot

From WMS gaming comes Mystical Unicorn, a fantastic 5-reel 20-payline online slot machine with lots of exciting bonuses and action. If you are starting to play slots, the Mystical Unicorn slot is for you; it has Autoplay, is relatively easy to use, and will come in handy if you are on a shoestring budget.

Look out for the unicorn symbols, they are the jackpot symbols and are stacked on every reel to boost your chances of winning it. If you land a free spin, a unique set of reels comes up with extra scatters and jackpot symbols to increase your probability of retriggering the bonus. These bonus games are what make this relatively new game a much-loved option, as they make you that much closer to winning a high-value jackpot.

5. Carnival Queen

Carnivals are thrilling; they are associated with energy, games, and fond memories. The Carnival Queen online slot machine will help you relive your Carnival experience and help you take home some cash with its Avalanche feature, Scatter, and wild symbols.

Carnival Queen is a 6-reel 4096 payline videos lot that is perfect for your smart device. The machine weaves the Carnival theme intuitively and has the most captivating graphics and inbuilt capabilities to improve your gameplay.

You get to choose the wager to place on your spins worth €0.10-€100. The symbols are card icons 9, 10, J, Q, K, and A. The highest paying symbols in this machine would be the gold crowns, which can give you up to €2,000. The avalanche feature is the best bonus, and a win triggers it. The Avalanche creates a multiplier of up to 7x at the bottom of the reels. The scatter symbol is the Carnival Queen, which provides you with up to 12 free spins.

HTML Is the Future

The games above are designed to give you the optimal slot machine gaming experience on your mobile device. They are friendly on your browsers and are both fun and safe to play on. Again, what is a great slot machine without the Graphics?