3 levels, increasing in difficulty and complexity. First, you go through a prison complex before entering an "Anti-Duke" training center where the aliens learn how to fight against Duke. In the finale, you have to find the power plant to shut down the whole installation.
Duke crashes down in a stolen alien cruiser but this time he is a little closer to home. Look for the new features. There's a special powerup called the SuperDukePak and a new actors amongst other things.
Bubble Hero 2 is a Windows game released in 1998. It is a sequel to the original Bubble Hero, and features new gameplay mechanics and improved graphics.
On the Tamagotchi Planet lives a special race of bug-like Tamagotchi characters called Mushitchi. While Mushitchi can be found all over the planet, their biggest and safest home is the Mushitchi Forest. Mushitchi hide amongst the leaves, grass, dirt, and under the ground. Due to this, other Tamagotchi wandering in the forest accidentally step on them occasionally. On the Morino Tamagotchi, the user is tasked with caring for a Mushitchi, helping it grow big while avoiding getting injured.
The Tamagotchi Ocean is an ocean life-themed Tamagotchi released in Japan in March 1998 and later on in the USA in August. The Tamagotchi featured a motion sensor, similar to the Tamagotchi Angel, which was used to scare underwater predators away.
The Ultimate Simpsons Doom is a graphics and sound mod made by Myk Friedman & Walter Stabosz and released in 1998. In the modification, you play as Homer Simpson killing evil clones of his friends, family, neighbors, and co-workers (they replace the normal monsters). As it only replaces graphics and sounds it can be used with either Doom or Doom II.