Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

๐Ÿ•น๏ธ Practice arcade

Extra games, not extra homework โ€” timed sprints, survival runs that end when your lives run out, and mastery drills built from the same skills English Grammar and Sentence Construction teaches.

Log in to play โ€” the arcade tracks runs per student.

โšก Sprints

Beat the clock.

๐Ÿ’€ Survival

Each miss costs a life โ€” lose them all and the run ends.

๐ŸŽฏ Mastery

No clock โ€” just get N in a row.

๐Ÿ”Ž Spot the Splice

Click the exact spot where two independent clauses got joined by a comma alone -- five in a row, no clock.

๐Ÿงฉ Pick the Structure

Simple, compound, complex, or compound-complex -- name the sentence structure five times in a row.

โœ’๏ธ Which Mark Goes Here

Semicolon, comma, or comma-plus-conjunctive-adverb -- place the one that's actually needed, five in a row.

๐Ÿค Make It Agree

Match the verb to its real subject -- past phrases in the way, each-of, and neither-nor -- five in a row.

๐Ÿท๏ธ Apostrophe Call

Its or it's, one owner or many, or no owner at all -- pick the right form five times in a row.

๐Ÿง‘โ€๐Ÿคโ€๐Ÿง‘ Case Closed

I or me, who or whom -- drop the other person or answer with he or him, five in a row.

โช Past or Participle

Went or gone, saw or seen -- the past stands alone, the participle follows has, have, or had.

๐Ÿ•ต๏ธ Who's Doing It?

Put the phrase next to its noun, give a dangling opener its doer, then call it correct, misplaced, or dangling -- five in a row.

๐Ÿ”ฆ Voice Check

Active or passive, passive or lookalike, then flip a passive around -- a be form plus a past participle, five in a row.

๐Ÿ” Same Word, New Job

Light the lamp or turn on the light, a fast car or ran fast -- read the sentence, name the job, five in a row.

๐ŸŽจ Adjective or Adverb?

Sang beautifully or tastes sweet, good or well, real or really -- check the verb, pick the describer, five in a row.

๐Ÿ” Clause Hunter

Mark the clauses: both halves of a compound, the dependent clause, then adjective and adverb clauses -- five in a row.

๐Ÿ—๏ธ Build the Structure

Snap clause tiles and connectors together into compound, complex, and compound-complex sentences -- five in a row.

๐Ÿ”ง Fix It

Mend a run-on, a comma splice, or a fragment with the right connector -- any legal fix counts, five in a row.

๐Ÿ“Ž Phrase Spotter

Find the prepositional phrase, the appositive, then name the verbal phrase -- five in a row.

๐Ÿ‘ฎ Comma Cop

Put in every comma the sentence needs and not one more -- joins, lists, dates, and asides, five in a row.

๐Ÿ•ต๏ธ Comma Thief

Stray commas snuck in. Take out every one no rule allows, and leave the ones that belong -- five in a row.

๐Ÿ”ค Capital Idea

Names up, seasons down, titles by the rules -- fix every wrong capital, five in a row.

๐Ÿ’ฌ Quote, Unquote

Inside or outside the closing quotation mark? Periods and commas in, colons and semicolons out -- five in a row.

โž– Colon, Semicolon, or Dash

A colon announces, a semicolon joins, a dash does either with attitude -- pick the marks that fit, five in a row.

๐Ÿ”— Hyphen or Not

Well-written essay or well written essay? Before the noun, after it, numbers, and prefixes -- five in a row.

๐Ÿค Match the Pronoun

Its or their? Count the noun it points back at -- groups, and-pairs, and neither-nor too -- five in a row.

โฑ๏ธ Keep the Tense

Hold the tense the passage started in -- unless something really did happen earlier. Five in a row.

๐ŸŽฏ Only Where It Belongs

Slide only, almost, or even right in front of the word it limits, so the sentence says what it means.

๐Ÿ‹๏ธ Parallel Bars

Lists, not only ... but also pairs, and comparisons -- pick the version where every part has the same form.