The Farseer Physics Engine is an open-sourced 2D physics engine designed for Microsoft’s XNA and Silverlight platforms. The Farseer Physics Engine focuses on simplicity, useful features, and enabling the creation of fun, dynamic games.

Demos 

• Feature Demos
• Throwing People

You'll find more samples in its SDK download. More...

Enjoy the smooth play in this classic two-player 8-Ball Billiards game, thanks to Justin Petersen from Clarity Consulting. Use your mouse to control the pool cue’s direction and power, as well as ball-in-hand Q-Ball placement after a scratch. For developers, you'll get to lean how force, motion and collision detection is done in Silverlight.

Play Online - C# and VB.NET Source Code 

Balloons is a simple game by Pete Brown demonstrating simple animation and dynamic UserControls in full-screen. "I wrote this to amuse my toddler and have managed to amuse a number of developers with it." Pete.

Online Demo - Source Code

TruckWars is a simple SilverLight real-time-strategy game. For each level, you control various trucks (and other vehicles), and use them to push down all the green buttons. Enemy trucks will try to stop you.

As always, learning Silverlight through games is fun and effective. You get to learn and play at the same time. This is one good game for you to learn how to move objects around with and without obstrucles. The intent is to have a system of interacting objects where the whole is more that the sum of the parts. For example, units can move, attack, push, carry, grow, heal, crush, and even clone. The board includes various blocks - like open space, water, and stop blocks - to allow for different strategy. There is usually several ways to solve each board.

Play Online - Download Source Code

Gary and Jonathan from Microsoft coded this chess game which provides a rich game experience with animated pieces and allows mix of human vs computer players. Two different implementations of the computer algorithm are provided in C# and JScript, both of which execute on the client-side.

Chess Demo - Chess Source Code

Digger by Lutz Roeder is Boulderdash game clone in Silverlight 1.1.

Digger Online Demo - Digger C# Source Code

This Bubble Factory game was originally created in J2ME (Java). This is basically a port in C# by Vincent Vergonjeanne to run on SilverLight 1.1. It is somehow amazing for the fact that it has been played thousands of time by pure gamers. Play Online

SilverNibbles is a port of Nibbles .NET to Silverlight, and Nibbles .NET is based on the Microsoft QBasic Nibbles game. SilverNibbles uses the Silverlight 1.1 Alpha, so that it can make use of C# code. SilverNibbles team have also taken advantage of the graphics capabilities of Silverlight to enhance the appearance slightly. A recent version can be played online.