nds4droid by jeffq is a free, open source Nintendo DS emulator written for Android smartphones. It is based off of the excellent emulator DeSmuME. The source code can be found on sourceforge. Read more about nds4droid v42 (NDS emu for Android)
PPSSPP is a PSP emulator written in C++, and translates PSP CPU instructions directly into optimized x86, x64 and (soon) ARM machine code, using an efficient JIT compiler. PPSSPP can thus run on quite low-spec hardware, including stronger Android phones and tablets, as long as there's support for OpenGL ES 2.0. Read more about PPSSPP v0.9.1 (PSP emu for Android)
nds4droid by jeffq is a free, open source Nintendo DS emulator written for Android smartphones. It is based off of the excellent emulator DeSmuME. The source code can be found on sourceforge. Read more about nds4droid v41 (NDS emu for Android)
In Blockaid by Jayenkai you have to guide a ball to collect the green blocks, whilst avoiding retreading the same path. Floor tiles will slowly reset as you move, but try not to create a blockade along the way. Additionally, there are randomly appearing walls, and spikes, which will attempt to thwart your efforts. Read more about Blockaid v1.0 (Android Game)
In OneDee by Jayenkai you have to run through halls collecting all the coins, whilst Keeping away from all of the dangerous red blockades that aim to thwart you on your quest. Avoid the oncoming bullets by using your trusty shield. How far can you get? Read more about OneDee v1.0 (Android Game)
In Puzzobomb - Endless by Jayenkai you have to match the colored blocks before the gameplay area overflows. Hold onto a Bomb block to blow it up, along with the 4 surrounding tiles. Read more about Puzzobomb – Endless v1.0 (Android Game)