Keisan Card (けいさんカード) is an arithmetic-card game for first-grade learners, designed for classic Palm OS handhelds. It practices addition and subtraction through six progressively unlocked levels.

Each session contains 10 questions worth 10 points each. Levels 1 and 3 show the completed equation and award a perfect score automatically. Levels 2, 4, 5 and 6 use an on-screen keypad: some ask for the result, while later levels hide one of the operands.

Addition and subtraction are mixed at random. Zero is allowed, but questions never contain negative numbers, negative answers, or mixed positive and negative notation.

A perfect 100-point session adds one clear. Ten cumulative clears permanently unlock the next level. A lower score never erases previous clears, and all previously unlocked levels remain playable.

Features include:

• Six levels covering facts up to 10 and facts from 10 through 19
• Result and missing-operand questions
• Touchscreen and Palm hardware-button controls
• Saved clear counts and unlocked levels
• Palm OS system sounds with a mute option
• Built-in hardware-key help screen
• Monochrome interface with monochrome and color launcher icons
• No registration code or external libraries required

Two otherwise identical builds are included. The JP build uses the Japanese launcher name けいさんカード; the EN build uses Keisan Card. Compatible Japanese ROMs display the game in Japanese, while other ROMs use its English interface fallback.

Compatibility

• Palm OS 3.1 or later
• Standard 160×160 Palm OS display
• 68K Palm OS application
• Designed to support the Handspring Visor Deluxe

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