Drag a term to the other side of a balance scale until x stands alone. Algebra Challenge is a high-school algebra game: move terms across the equals sign, then tap Divide. Algebra I is a two-step linear equation. Algebra II puts x on both sides. Advanced includes negative terms. Score and Streak climb until the clock runs out.
Factor, solve, and analyze quadratic equations — pick the correct answer from four choices. 45 problems across three tiers: Algebra I (factoring trinomials, solving by roots, parabola direction), Algebra II (quadratic formula, vertex form, completing the square, discriminant), and Advanced (Vieta's formulas, transformations, applications, function composition).
Master the logic of if/then conditionals (P → Q). 45 problems across three levels: Foundation covers the truth table for P→Q (vacuous truth, the one false case), Modus Ponens, Modus Tollens, and why Affirming the Consequent and Denying the Antecedent are invalid. Intermediate adds the contrapositive, converse, inverse, biconditional (P↔Q), the disjunction equivalence (¬P∨Q), and hypothetical syllogism. Advanced covers chained conditionals, negation of conditionals (¬(P→Q) = P∧¬Q), tautologies, complex truth value analysis, and edge cases.
Identify whether an argument is deductive, inductive, or abductive — and name the logical fallacy when one is present. 45 problems across three tiers: Foundation covers the most common fallacies (ad hominem, straw man, false dilemma, slippery slope, appeal to authority, bandwagon, hasty generalization, appeal to ignorance) and basic argument types. Intermediate adds subtle informal fallacies (post hoc, tu quoque, anecdotal evidence, appeal to nature, poisoning the well, circular reasoning, relative privation). Advanced covers formal fallacies (affirming the consequent, denying the antecedent, modus tollens), validity vs. soundness, equivocation, and abductive reasoning.
Master the laws of exponents — pick the correct simplified form or value from four choices. 45 problems across three tiers: Algebra I (product, quotient, power, zero, and negative exponent rules), Algebra II (fractional exponents, scientific notation, combining multiple rules), and Advanced (solving exponential equations, complex multi-rule simplifications).
Test your vocabulary by picking the closest synonym from 4 word choices. Tiered from Grade 9 to SAT prep across General, Science, Literature, and History — with an eliminate-a-wrong-answer lifeline to make it strategic.
Given a Latin or Greek root (e.g. port = carry, bio = life), tap every word on screen that contains and derives its meaning from that root. Tiered from Grade 9 common roots to SAT-level classical morphemes — the fastest way to decode thousands of English words at once.
Test your vocabulary by picking the correct antonym from 4 word choices. Tiered from Grade 9 to SAT prep across General, Science, Literature, and History — with a fill-in-the-blank context clue to help you crack the toughest opposites.
Find missing angles and apply key theorems — pick the correct answer from four choices. 45 problems across three tiers: Geometry I (complementary, supplementary, vertical, linear pair, triangle sum), Geometry II (parallel line angle pairs, polygon interior sums, inscribed angle theorem), and Advanced (multi-step proofs, circle chord angles, exterior angle formulas, cyclic quadrilaterals).
A sentence is missing its key word. Stamp the vocabulary tile that fits the meaning — not just the grammar. Race a 75-second timer or survive with three lives across Grade 9, Grade 10, and SAT sentences in General, Science, Literature, and History.
Four near-synonyms appear on screen — same basic meaning, but very different emotional weight. Is 'thrifty' the most positive, or is it 'frugal'? Is 'arrogant' worse than 'presumptuous'? Pick the word that best matches the prompt (most positive or most negative) across 45 questions tiered from Grade 9 to SAT Prep.
Spot the grammatical mistake in a sentence and pick the correct replacement for the highlighted error. 45 problems across three tiers: Middle School (subject-verb agreement, apostrophes, comma splices, there/their/they're, double negatives), High School (dangling modifiers, parallel structure, who/whom, subjunctive mood, lie/lay), and SAT Prep (idioms, concision, that/which, restrictive clauses, advanced agreement patterns).
Master sine, cosine, and tangent — the three foundational trigonometric ratios. 45 problems across three tiers: Geometry (SOHCAHTOA definitions, 3-4-5 triangles, special angles 30/45/60), Pre-Calculus (reciprocal functions csc/sec/cot, radian conversion, co-function identities), and Advanced (inverse trig, second-quadrant values, Pythagorean identities, real-world triangle applications).
Solve linear systems of two equations by substitution, elimination, and word problems. 45 problems across three tiers: Algebra I (simple substitution and system identification), Algebra II (multi-step elimination, multi-step substitution, and real-world word problems), and Advanced (parametric systems, fractional coefficients, three-variable extensions, and SAT-style applications).
A phrase with a missing word — pick the one that sounds natural in English. Covers the three biggest collocation challenges: which verb fits (make/do/take/have), which preposition follows the verb (rely on, consist of), and classic fixed phrases (burn the midnight oil, foregone conclusion).
A short passage appears with one word highlighted. Use the surrounding sentences to figure out what it means, then pick from four definitions. Directly simulates SAT Reading comprehension questions. The SAT tier focuses on common words used in unexpected academic senses — the most tested skill on the exam.
Test your SAT and academic vocabulary by choosing the correct definition from 4 options. Tiered from Grade 9 to SAT prep across General, Science, Literature, and History — the smarter way to build word power.
Two sentences are shown — one uses the word correctly, one doesn't. Tap the right one. Tests the most common vocabulary mistakes students make, from grade-9 confusable pairs (affect/effect, allusion/illusion) through SAT-level pitfalls like meretricious, opprobrium, and circumlocution.
Three words belong together, one does not. Tap the word that doesn't fit — based on shared roots, similar meanings, or subject category. Tiered from Grade 9 to SAT prep, with root-based false-friends, synonym-or-opposite traps, and cross-discipline category puzzles.
A base word appears on screen — your job is to tap every word in the list that belongs to the same word family. Does 'joyful' come from 'happy'? No — but 'happiness', 'happily', and 'unhappy' do. Covers Grade 9 common words through SAT-level morphology across 45 questions with 3 difficulty tiers.