21. GalaxIR

GalaxIR is a futuristic strategy game with an abstract look, where players micro-manage an attacking alien fleet. Pick a planet, pick an attack point, then hope your troops have the balls to carry it off. There's not much structure to the game as yet, but that's what you get when you're on the bleeding-edge of free, independent Android gaming development.

GalaxIR

22. Graviturn

Graviturn is an accelerometer based maze game, where the aim is to roll a red ball out of a maze by tilting your phone around. Seems embarrassingly easy at first, until increasing numbers of green balls appear on screen. If any green balls roll off the screen you die and have to try again. It's abstract. It's good.

Graviturn

23. Alchemy Classic

There are a few variants on Alchemy out there, each offering a similarly weird experience. In Alchemy Classic you match up elements to create their (vaguely) scientific offspring, so dumping water onto earth makes a swamp, and so on. It's a brain teaser thing and best played by those who enjoy spending many hours in the company of the process of elimination.

Alchemy Classic

24. ActionPotato

In ActionPotato you control three pots. Pressing on the pots makes them jump up into the air, where they harvest potatoes. See how many you can get in a row. That's the gist of it. And don't collect the rotten potatoes, else you die. That really is it. The Google Play stats say this is on well over 1,000,000 downloads, so it's doing something right.

Action Potato

25. Scrambled Net

Scrambled Net is based around the age-old concept of lining up pipes and tubes, but has been jazzed up with images of computer terminals, high score tracking and animations. Still looks like something you'd have played on a Nokia during the last decade, but it's free - and looking rubbish hardly stopped Snake from taking off, did it?

Scrambled net

26. Dropwords

Dropwords is laid out like your standard Android block-based puzzle game, the difference here is we're not dealing with gems - you make blocks disappear by spelling out words from the jumbled heap of letters. There's not an enormous amount of point to it, but you can at least submit your scores and best words to the server, where an AI version of Susie Dent will pass her approval.

Word drop

27. Barrr

What you do in Barrr is man-manage a bar world, pointing men at the beers, games or tattoo parlour, then taking their money off them once they're drunk and happy like a good capitalist. And make sure they go to the toilet. Things, as things do in games, soon start speeding up and it gets rather insane and difficult.

Barrr

28. The Simpsons Tapped Out

We'll be the first to admit that the Simpsons of today is a husk of its former self, with many a writer going on to bigger and better things. But, The Simpsons Tapped Out is one addictive game that will bring you both frustration and elation. Yes, it will bombard you with in-app purchase requests but you can play for free, building your own perfect version of Springfield.

The Simpsons Tapped Out

29. Wordfeud

Wordfeud is a superb little clone of Scrabble, with a big, clear screen and online play options that actually work. The game's been offered for free with some hefty advertising over it thanks to the developer being based in Norway - which only received paid-for app sales support recently. A paid version may arrive soon, but Wordfeud remains free right now.

Word feud

30. Friction Mobile

Friction Mobile is a very odd concept that makes no sense in still images. You fire a ball into the screen, then try to hit that ball with other balls until it explodes. The catch is you're not allowed to bounce balls backwards into your own face. Because then you die. Sounds rubbish, but works well. It's free, so give it a no-obligation, no-commitment whirl.

Friction mobile

31. Geared

Geared is a weird little thing finally converted over to Android from iPhone. It's an embarrassingly simple concept - players slot different sized cogs into place on the screen, with the aim being to power one gear from another. Then, as is video game tradition, it gets harder and harder. Plus there are 150 levels of it all.

Geared

32. Meganoid

A stunning little retro game, Meganoid plays and looks like something that ought to be running on a Nintendo emulator. But it isn't. It's new and on Android. It's a speed-based challenge, using on-screen or accelerometer controls to jump and bounce through ever-hardening levels. Developer Orange Pixel is aggressively supporting it, too, with constant map packs, characters and more regularly appearing for download.

Meganoid

33. Cordy

A standard and traditional platform game. Cordy is a speed-based affair, with players running, jumping and collecting their way through its pretty green levels, using an electrical cable to jump, swing over obstacles and grab energy. Uses on-screen buttons so can be a bit tough to play, but comes with 12 free levels to get you going.

Cordy

34. Angry Birds Rio

Yet more Angry Birds for fans of the simplistic trial and error physics game. Angry Birds Rio is another chapter-based effort as well, with developer Rovio leaving tempting empty slots on the menu screen for periodic updates of new levels. More of the same, but with a prettier, 3D look to it this time thanks to a vague association with animated movie Rio.

Angry Birds Rio

35. Grave Defense Holidays

As with Angry Birds, the maker of this superb tower defence game has spun out a separate version it fills with seasonal levels. Recently updated with an Easter map, this free version of the game also includes Valentine, Christmas and St Patrick's Day themed maps. Currently calls itself Grave Defense Easter. Easily one of the best examples of the tactical genre.

Grave defense

36. Words with Friends Free

The popular iPhone Scrabble-alike is now on Android, with an ad-supported version up on Google Play for free. Words with Friends Free should actually be called Words for People Without Any Friends, as once installed it lets users play with complete strangers online - or pick specific people from your contacts list. It's turn-based, so several ongoing games can be strung out for days.

Words with friends free

37. PewPew

Very similar in style and concept to Xbox and Xbox 360 retro classic Geometry Wars. In fact, one might legally be able to get away with calling it a right old rip-off. Android PewPew is a rock-hard 2D shooting game packed with alternate game modes. It's a bit rough around the edges and requires a powerful phone to run smoothly, but when it does it's a fantastic thing.

PewPew

38. Angry Birds Friends

It's Angry Birds business as usual; only with Angry Birds Friends you get a social-themed makeover that adds challenges, Facebook integration galore and scoreboard tools to make the simple physics game more of a multiplayer experience.

The good thing is the way you can access the same account and see your progress on mobile and through Facebook on desktop, the bad is the looming presence of in-app purchases, with "bird coins" required to be earned or bought to progress quicker.

Angry Birds Friends

39. Beats, Advanced Rhythm Game

A standard rhythm action, button pressing music game for Android. Beats manages to outdo the official music games by including a Download Song tab, where it's possible to install new song files created by users. It's very hard and very fast. Just like they should be. Runs perfectly on an HTC Desire, too, so there's no blaming glitches for not doing very well.

Beats