Flurkies is a cute, addictive and fiendishly difficult puzzle game, where you have to use a team of small fluffy creatures to collect coins and then get them to the level exits.
4 In A Line is a phone version of the classic board game Connect 4, also known by its older title Captain's Mistress. ZingMagic specialise in good AIs for their titles, and it's surprisingly difficult to beat this game consistently. There are also Bluetooth and text message multiplayer options so you can play against human opponents.
Frozen Bubble is a freeware open source version of the classic Puzzle Bobble (aka Bust-A-Move). The aim of the game is to match up similar-coloured spheres before they reach the bottom of the playing area.
A variation on the classic "Lines" puzzle genre, with a distinctly Summer-filled theme to keep things cheerful.
Hexxagon Labs is a modern reworking of the classic Othello/Reversi concept, with a board made up of hexagons, games involving two or three players, and the occasional hole in some boards.
Hidden Expedition: Titanic challenges you to scour the wreck of the RMS Titanic for lost artefacts before your oxygen runs out.
Lament Island is a 3D action-adventure game, like a sort of Chinese equivalent of Tomb Raider but with the emphasis on puzzles rather than combat. As well as the usual button-controlled gameplay, some puzzles require the use of your phone's camera and microphone.
Marble Maze uses compatible phones' accelerometers (motion/tilt sensors), so you can steer the marble through the game's mazes by just tilting your phone.
No, this isn't the real Mah Jong, it's just another match-the-tiles Shanghai clone misusing the Mah Jong name. However, if you enjoy matching tiles this game might be to your tastes, and it has some online community and rankings features too.
PaintBall 2 takes a simple concept of matching coloured spheres and builds several different game modes around it.
Quartz 2 is a puzzle game for phones which involves dropping various colourful diamond-shaped blocks into a diamond-shaped playing area. As well as a straightforward single-player mode, there are also various multiplayer options where you can play against other humans over Bluetooth or against CPU players.
Robo is a puzzle game which involves reflecting laser beams round a maze using mirrors, perhaps inspired by the classic 8-bit computer game Deflektor.
S-Tris is a freeware clone of Tetris, and includes the basic mode as well as several optional extras.
This is a rather good Sudoku game with a particularly intuitive number entry system that works entirely through the direction pad.