We can change the background with an option or when we change between levels.

At some place we need to show:

Current sum + number to catch = new sum

The "number to catch" is the hidden variable that must be solved by the player. If it is resolved correctly, the score is updated and the game continues. If not, the game is over.

I have already tested the Linux version: 45 MB of a single binary that works out of the box. I need to analyze hwta must be already installed in the Linux distro so the binary run (ldd).

https://www.kenney.nl/

• Add icon (circle with numbers in different positions)
• Increase the difference between levels:
  • level 0: just additions at low speed, 10 points, just to learn, numbers 0-2
  • level 1: increase the speed, numbers 0-4
  • level 2: add subtraction
  • level 3: add multiplication
  • level 4: add division ok
  • level 5: increase speed
  • level 6: numbers 0-6
  • ...
  • level 10 ... change the background
  • ...
  • level 20 ... change the music

During the game we have tons of options to play with:

• Mobs on/off
• Velocity of the mods
• Number of mods
• Math operations to include
• Numbers range
• Velocity of the numbers
• ....

So we must play with all of them and modify them as the game advance.

• Level 0: no mobs, add op, 0-2 range
• Level 1: no mobs, add and sum op, 0-2 range
• Level 2: no mobs, add and sum op, 0-5 range
• ....

The change between levels must be done based on score, that could be the number of numbers hits correctly.

Proposed config options:

• Operations: Add, Subtract, Multiply, Divide
• Numbers range
• Mobs ON/OFF

The goal of this game is educational. But it must be attractive and ideally, addictive. It uses the Godot engine so the possibilities are huge. My idea is to use as much as possible the physics engine (to minimize the code needed to implement the game) and in the first iteration it should help children to play with numbers: sum, subtraction, multiply and divide.

The basic idea is that random numbers will appear and the player must catch them in order to complete the goals: find a number to complete a sum, to find the result of a substraction ... The possibilities are endless.

There will be scores in order to motivate the child for the different game modes.

Probably there will be an initial screen to select the game mode (sum, substracion, multiply, division) and during the game, the HUD will show the target math operation that must be solved capturing the numbers.

My child (7 years) has tested the current version and it has played during some minutes. So it is promising.

Ok, in order my kids play with the app the plan is to install it in our Android mobile phones.

For doing it:

• Support moving the player with touching the screen in the mobile phones
• Create APK with the correct screen orientation (portrait)
• Upload it to Google Drive so it can be installed
• Document howto to install it for third guys interested in the app

In the HUD instead of showing "Start" let's show the four operations:

Add         Subtract
Multiply    Divide