2 and 1 can be said to have not much difference, yet also significant differences. At the start of the game, if you click in the middle as usual, you will notice a few more menus (if you pull the menu up, there will be more). At this time, the second-to-last one is Settings, the fourth one is Change Language, the first menu item is to start the level you haven't cleared yet (only the first one will appear), the second is the level you have already completed, which you can replay. There are a total of nine levels (at least, I only played up to level nine). Many aspects of the game are similar to 1, but when changing weapons, instead of directly switching to the next one, a weapon menu appears, showing the weapons you have equipped (explained later). The first one is a physical attack that goes to energy, and the rest depend on what you have equipped. Each time you clear a level, not only will your score be calculated, but there will also be things like ??? + ??? = ???, which indicates the score needed to unlock the next robot. When the total reaches = ???, a new type of robot will appear. The third item in the main menu is the previously mentioned equipment, where you can check the current robot's equipped weapon and additional effects. Though not easy to understand, each item has a number attached; for weapons, it's the power, and for additional effects, it's the level and the added quantity. The fourth menu is to see your highest game score, and the fifth is the list of robots you currently have. In the lower-left corner, you can see that robot's data, such as health, and so on. That's it, and you can use your robots to defeat enemies (URL = http://WAP.7723.CN/wadyx/view.asp?myid=&text=&idd=162&id=6338) download link (/URL). I forgot to mention, unlike 1, not every level is about defeating all enemies. Level 1 is to eliminate all enemies. Level 2 requires destroying all turrets on high platforms (if you keep destroying enemies continuously, they will keep respawning). Level 3 requires destroying everything that looks like chimneys made of bricks… I forgot the later ones. Changing to Japanese helps understand a bit. Each level has a different time limit, and the task must be completed before the time runs out.