All these games had one thing in common - They were puzzle based games based on some phyics law and you had to optimally use the limited resources to complete a level.
1. LTank (laser tank)
Long back when I was new in software industry, working for CMC, one of my friends gave me a game - LTank. The idea is simple: You have maze like structure, you can move around your tank in that maze. You can shoot, the static enemy tankers too shoot if you fall in their visibility range. You additionally have reflectors which can divert the shot. Arrange the reflectors so that you are not shot by enemy but you can shoot at them. You also have objects like bridge which you have to shoot and take it near the waterbody so that you can cross it.
Extremely tough to complete and one wrong move can do a stale mate. If someone knows sokoban, then this is a modified version of sokoban.
If anyone is interested in looking, you can view details at
http://en.wikipedia.org/wiki/Lasertank
2. Prism
Got this one from my friend as soon as I switched to a new company.
This is a completely optical game. You have one or more light sources and a few targets. All the targets must receive light sources. You have straight and angular reflectors so that you can deflect the light. You also have beam splitters and actual prism so that you can split and unite the light.
Gets extremely tough and when we get a prism to use and targets seem impossible.
I could find a working version at http://flashgamesspot.com/play/prism-2-puzzle-games-involving-laser-beams-and-mi/flash-game/
3. Gravity Master
By this time flash has completely killed the dirty .exe file exchanegs by friends and new sites have cropped up containing unlimited number of games to imagine.
Next comes gravitational force and creation of objects. This was my all time favourite and an extremely addictive. Again the principle is the same, you have a ball and you need to make it touch all the targets. You might have impossible looking valeys in between and might have to use somehting like a weight balance to make the ball jump.
This can be played at http://www.gravitymaster.net/
One additional great feature of this game was that you can make your own levels and I remember having made a level which was exrmemly difficult to solve.
4. ricochet kills
A game which does not have too much physics, but refreshed my memories about other puzzle games. You have limited bullets and the bullets are strong enough to reflect and pass through many people. You might be lucky many a times because the bullets sometimes relfect beyond imagination and give you unexpected results.
It is good that the oppnents do not shoot, else it would be a boaring game to pay.
Also, unlike some other boaring games, the level does not get reset to zero on 3 unsuccessful attempts which allows you to retry a level unlimited times.
Can be played at : http://www.addictinggames.com/shooting-games/ricochet-kills-2-game.jsp
Custom level that I created :
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