Ultimate Aussie Maths Invaders is an Australian educational game about mathematics, designed as a simple Space Invaders-style arcade shooter. You must type in and shoot the correct answers at a series of slowly-descending maths questions. Developed...

Is it a game? Is it adult-themed? Is it nonsensical? It's certainly a piece of interesting shareware history. It's Underwear Girl, a dressup game with no endgame other than your own desires. Speaking of which, the secret code is...

Underwear Girl 2, sequel to the original but now with more animation, dancing, music, and more. This time, the "secret" isn't a code you input, but was a special version of the file you received from the author, who provided the...

This is an unreleased 3D remake of the original freeware Unicycle! It's only a prototype, so missing features such as audio and a goal. It was originally developed around 2000. Thought to be lost, Brian Kendall found the source and recompiled...

UFO: Alien Invasion is an open source game inspired by the X-COM series. It is the year 2084. You control a secret organization charged with defending Earth from a brutal alien enemy. Build up your bases, prepare your soldiers, and lead...

Utaan Attack is a B&W arcade game in which you have to defend your cities against invaders by aiming the mouse in the sky and pressing the mouse button to fire lasers.  Utaan Attack features very crude sound effects and cannot be quit...

A nice little Yahtzee clone this one.

An addictive endless runner starring a clown and his unicycle. Features multiplayer modes.