Practice doubles addition facts (1+1, 2+2, … 10+10) with a fun mirror/shadow visual theme. See the number and its reflection, then tap the correct double. Three difficulty levels including near-doubles.
Choose Difficulty and Mode
Pick Easy (doubles to 5+5), Medium (to 10+10), or Hard (to 20+20 with near-doubles). Then select 60-Second Rush or Survival (3 lives).
Look at the Mirror Card
A number tile appears above a mirror line with its reflection below. The equation shows n + n = ? (or a near-double on Hard). Calculate the double mentally.
Tap the Correct Answer
Choose from four large colored buttons. You can also press keys 1–4 on desktop. Correct answers light up green and the mirror glows; wrong ones turn red.
Build Your Streak
String together correct answers for a fire streak. In Rush mode keep answering until 60 seconds are up. In Survival avoid 3 mistakes to stay alive.
Mirror Visual Theme
Each problem shows the number as a bold tile with its shimmering reflection below a mirror line — reinforcing the concept that doubling means having the same number twice. Correct answers make the mirror glow; wrong ones crack it.
Three Difficulty Levels
Easy covers doubles 1+1 through 5+5, perfect for beginners. Medium extends to 10+10. Hard goes to 20+20 and introduces near-doubles (like 7+8) that build on known doubles facts.
60-Second Rush and Survival Modes
In Rush mode, answer as many doubles as you can before time runs out. In Survival mode you have 3 lives — each wrong answer costs one. Choose the pressure that motivates you.
Four Colorful Multiple-Choice Buttons
Big purple, fuchsia, violet, and indigo buttons make answering easy on touch screens. Keyboard shortcuts 1–4 enable fast desktop play. Streak counter ignites at 3 correct in a row.
Double Trouble is a fast-paced math game focused on doubles facts — adding a number to itself (1+1=2, 2+2=4, … 10+10=20). A mirror-themed visual shows the number and its reflection, reinforcing the idea that doubling means 'the same again'. Easy mode drills doubles up to 5+5 for young learners. Medium extends to 10+10 — the core doubles facts every student needs. Hard mode introduces doubles up to 20+20 and near-doubles (like 7+8 = double 7 + 1), which teach students to leverage known facts to solve related problems. The multiple-choice format with four colorful buttons keeps gameplay snappy on any device.
Doubles Are Foundation Facts
Knowing doubles instantly (6+6=12, 8+8=16) is one of the most efficient mental math strategies. Many addition facts can be derived from doubles — if you know 7+7=14, then 7+8 is just one more.
Mirror Theme Reinforces Concept
The visual mirror/reflection makes the abstract concept of 'same number twice' concrete and memorable. Kids connect the visual image to the math, deepening understanding.
Near-Doubles Extend Learning
Hard mode introduces near-doubles (n + n±1), teaching the powerful strategy of 'double and adjust'. This bridges from memorized facts to flexible mental computation.
Builds Speed for Timed Tests
Rapid-fire practice with immediate feedback trains students to recall doubles facts in under 2 seconds — the fluency standard expected in most curricula.
Doubles facts are addition problems where both addends are the same number: 1+1, 2+2, 3+3, etc. They're considered 'anchor facts' because many other addition facts can be derived from them.
Near-doubles are addition problems where the two numbers differ by 1, like 6+7 or 9+8. If you know 6+6=12, then 6+7 is just 13. Hard mode introduces these to build on existing doubles knowledge.
Easy mode (doubles to 5+5) suits ages 5–6 learning their first addition facts. Medium (to 10+10) fits ages 6–8. Hard with near-doubles challenges ages 7–10 developing mental math strategies.
Yes! Press 1, 2, 3, or 4 to select the corresponding colored button. This lets desktop players answer quickly without reaching for the mouse.
Yes. Your best score is saved locally in your browser for each combination of difficulty and game mode. It's shown on the settings screen so you always know what to beat.